I don't think that low tiers are limited in there abilities to play certain styles, they're just unable to use those style of play to their maximum potential as high tiers can. By limiting yourself, you pay alot more when you make a mistake. It teaches you to spot opening and exploit them to your best ability and keep yourself defended as best you can.
Once you combine this with a high tier, you'll be able to catch them off gaurd more and abuse them appropriately (0 to death combos usually). And you'll be able to prevent your opponent from getting in a position to harm you badly, if at all.
If you are going to play in tournaments, I wouldn't suggest training by playing a low tier. It's much better to just learn these things with your high tier of choice. I'm just saying that these skill's (reading your opponent) are more important to surviving with a low tier. If you can't read your opponent with a high tier, you can just laser camp and pillar. No thinking required.