I agree with small bodies but I see a lot of swordies struggle to beat jokers that pop off with gun mobility.
Swordies are struggling with Joker because they don't know the match up yet.
Getting impatient is a really standard response to not understanding a match up.
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As for the gun dash waveland tech, you can't act until the animation is over, so it's usage is rather situational.
One of the best ways I've been able to find to use it is to trick people with how much distance I can cover by immediately down tilting.
If I was to gun dash waveland to try to grab, I would be stuffed every time by anyone that expected that option because they would be able to act before I could.
This is especially true of swordies that could space disjoints.
I could see using the slide off on platforms being used similarly to Palutena teleport edge cancels in the long run, but you are overestimating it's usefulness.
Also, I believe the gun dash counts as a dodge and is impacted by the dodge penalty in Ultimate making it laggier the more you use it.
The most useful thing about is the amount of space you can cover.
If someone short hop guns, there are likely only two things they will do from there dash in or dash back.
Dash in your can stuff and dash back doesn't go as far, so for creating space with the dash, you'd need to b reverse the gun and that would telegraph it.
I think there will be some real uses for it long-term, but for now people are just being surprised by it, it isn't really that good of a tool.
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Also I'm more than aware of Joker's gun mobility options but they really aren't that useful for recovery.
1) They are horribly telegraphed.
2) There is a huge wait time between shots.
3) They don't actually cover that much distance per dash.
4) There seems to be a limit of three dashes in total.
5) They count as a dodge and seem to be affected by the penalty.
Even if you were hit to the very top corner off stage, I doubt you'd be able to make it back to stage with guns alone.
Even if you could, your trajectory would be entirely too obvious.
Guns will likely be important to recovery at some point, but I think primarily in finding a way to mix up recovery.
They aren't a great recovery option in and of themselves.