I mean, when I said others I meant others playing against me. They haven't noticed any difference when I've been playing via wired or WiFi. It is anecdotal, sure.
You said it yourself though it can vary widely on router and environment. While Wi-Fi will never be as good as wired, it still isn't always doom and gloom like some people here seem to suggest.
Fact is, for some people it's impossible to go fully wired. That's why I have powerline adapters lying around in my current situation. I can plug it into a console or pc when I need to. Getting an actual cable going through ones house can cost a lot of money. I think it's a bit elitist and unfair to go everyone who uses WiFi is going to negatively affect your experience with the game and so they should be avoided like the plague. I'm somewhat fortunate that a powerline adapter even works, in some houses it isn't due to how the wiring/circuits are done.
Whatever though, I guess it's optional.