Do you even play this game?
Mythic iLevel gear comes from 2100 rated gear which can be easily bought with WoW tokens via boosting or just in general grinding to get it.
PvE players are required to do PvP content or they fall behind, the gear is too easy to get and it helps a lot even in Mythic progression, and even if it’s not high end like 2100, the 1800 gear is also Heroic iLevel so it makes no sense how you can even begin to think that PvP is not more populated than it’s ever been.