You're missing the point here. I'll quote myself again
Just because you "can" do everything without paying to win, it doesn't mean you can't pay to win. And in the end the "winners" are all paying, a great deal of real money goes into the world first races. Pay 2 win isn't about exclusive power gains from real world cash, it's about the game catering to players who want the "option" to gain through real world cash.46 pages of pointless mental gymnastics to philosophise why pay to win isn't pay to win.
Can you buy BIS items from AH? Yes, you can. Can you buy items from websites for real cash like Diablo 2 days? Yes you can. Are world first guilds power buying the best items across multiple realms in order to gain a competitive advantage? Yes they are. Can you buy gold with real cash used to purchase these items from AH? Yes you can and from Blizzard themselves, who profit more when you do.
Yes it's pay to win, if that hurts your feelings you can rationalise or mind bend your way around it to make you feel better but that doesn't change the facts or the perception, either way it's not going to change so play or don't play.
Can you gain a significant competitive advantage if you partake in the "P2W" aspects? Absolutely, and it happens all the time, it's a big part of the competitive side of the game. To say otherwise is to be in denial, mental gymnastics only serve to help you fool yourself on this matter.