Unfortunately, for me for the first time in WoW ever since starting back in Vanilla 15 years ago, I feel that indeed it has reached the point where having $$ to spend ingame gives a very real advantage.
Corruption system suffers from the same issue as early Azerite, where acquisition is way too slow and what is "easier" to get is not optimal at all, despite often being in top difficulty content. EXCEPT, you can now literally buy it off AH, BIS corruption pieces and all.
For example in my case "Expedient" corruption is simply a boatloads better than almost anything else by a good margin and out of all Expedient items I have - only one was a natural drop for me - the rest AH. The power I bought is very real, no it's not 100% more damage, but it is easy 10-15% right there for what amounts to about 15 tokens worth of gold total for me. For mythic raiding it's a lot.
Yes, some people may argue semantics there as in "you are not "winning", so it's not Pay2Win" and other nonsense, but frankly that's a very shaky defense - if we even get there, it's already showing things are not very good on that front.
- - - Updated - - -
And as a side note, people certainly can't claim I'm some Blizz hater or some such. In general I am positive about Blizz and WoW team, but they really have gone and fucked it up this time around.
I hope we won't have this shit at this magnitude in Shadowlands. They have taken this too far for my tastes.