"Battlefield is a better projectile camping stage than Final Destination" is false. Here's the tactic that defeats it. Just stand on the platform. If they are tall, you can very likely hit them with something (Mr. Game & Watch is too pro at it with his dair; I'm sure others have their own tricks). If they are short, they probably can't very easily hit you without jumping which in that position is going to totally wreck any attempt they were making at camping. Well, Meta Knight can with utilt, but he doesn't have a projectile so that works out really beautifully. In any case, their options basically are three.
1) Jump/Attack. You can counter both of these as you could counter any direct attack. The battle has ceased to be one of projectile camping at this point.
2) Move away. You can drop through the platform and give chase. If they outpredict you and get away, use the platforms to reset the position.
3) Do nothing and wait. Well, two can play at that game, and you can position yourself in optimal position and do feints and such (maybe even just drop through and attack from above without all that, depending on matchup). This is not a fundamentally unsound position for you like some people think; you're in control of the situation as long as they refuse to take initiative.
On Final Destination, you have to actually navigate the projectiles and can't position yourself on a different horizontal line from them. The lack of vertical play makes it way too easy to define the game around grounded play which is where the projectiles are strong. The Yoshi's example is another case; my solution to that position if I don't have a projectile effective in that situation (and Mr. Game & Watch does not) is to simply stand on the platform and position my approach from there. What is Diddy Kong going to do? He could throw bananas up which are easily countered and I can exploit to run him out of bananas, he could jump which puts him in his weakest area and my strongest, he could maybe try utilt or usmash if the platform dips right but is going to be so predictable that he'll be eating something from me when I see it coming a mile away, or he could just stay down there and play footsies with me which adds a whole new level of parity as suddenly I'm not being pressured very substantially as I vie for position. Really the main characters I see exploiting the positional strength of being under platforms are ones with the best ability to hit the platform from below. Those would be Meta Knight (utilt), Marth (take your pick), Ike (utilt/usmash), or to a smaller extent Mr. Game & Watch (Fire). None of them have competent projectile games. The closest characters to utilizing projectile spam in conjunction with platforms effectively are probably Link and Toon Link, but I'm not really sold on something like Battlefield being better for them than Final Destination even with that factor.
Anyway, I sense a moderator situation brewing here. Guys, let's be really honest here. A lot of people have been arguing about this for a very long time. Thio, Meno, bobson, Linkshot, and I are definitely all in that group. We all have pretty strong opinions on this. Someone like sunshade is more recent, but he also very obviously has very strong opinions. Some of these are not in agreement. It's because, philosophically, we have different ideas about the basis for stage rules in the first place. Our game experiences don't exactly agree either. I can tell you, based on countless serious competitive matches on it, that I am absolutely convinced Norfair is a perfectly fair stage and should completely obviously be legal at every tournament. I can say I have seen people try every "broken" tactic on it, and I have seen those tactics brought down to earth. I have seen some radical play there that works, and I have seen the evidence that it's not degenerate and instead is something positive. I am going to take a wild guess that some people here don't share my enthusiasm for Norfair. I am going to guess they live hundreds of miles away from me, and we are probably never going to be able to play to allow our metagames to clash and see the result. Even if they did meet, we might disagree on the virtue of the play there.
The point is that I hope everyone is honest enough with themselves to know that none of the major posters around here are going to convince each other of anything save maybe a minor point every once in a while. I tried several times to have us work to produce something that was actually substance here instead of an ever-flowing ever-shifting argument; no one was interested. I don't think it's totally worthless to post; most people don't have these same strong opinions we do, and silent masses are far more likely to be swayed by strong arguments between strong opinioned people. However, understanding that you are not actually going to move the mind of the person you are directly arguing against most likely, there's no reason to get heated over the argument. Everyone is really needing to just lighten up. I think there's value in this topic, and I think we all do both our own causes and the smash community the best service if we all keep cool heads and put politeness and civility first.
I really don't like infracting people. If I can tell someone something to modify bad behavior and it works, I see it as the best outcome. If once in a while, someone new (as in new to posting around here) posts something that is a little sketchy but still kinda okay, I'm inclined to let it slide with the hope that they are trying to find their niche in making positive posting and may be more successful with future posts if not discouraged by an immediate heavy hand. Just point out how weakly supported what they are saying is or how easily refuted it is as to be inconsequential and move on (you can do this in a nice way, and it is better if you do). Every once in a while, things get kinda bad in this topic. It's an issue people are passionate about; I understand. However, we're crossing some lines of civility right about now so let's turn this the other direction. If we do that, it works out far better than the other possibility where I start infracting people I really don't want to infract to enforce good behavior.
I am going to say that polite posts are also more convincing to anonymous people. Seriously, no matter your intentions, if people think you seem like a bully or don't seem nice, they won't care even a little about what you have to say. I'm not going to name names, but some of the people with the worst reputations in the smash community ended up on the wrong side of that...