From what I have read here, the posts were not talking about people being on wifi or the like apart from NeroOps. The point was that the the chosen netcode for this game is not good enough. I think most people know this about trying to do the best for your own connection hence why I said in my last post:Having a wired connection doesn't help if the other person is on WiFi. It can still increase the input delay the game applies and make the game feel sluggish.
There is definitely some problems with the online especially with one sided lag (I cannot play one of my friends because of this) or delay but you would expect most people on here or amongst friends who are pretty serious about fighting games in general to be wired.