It might be worth 're reading my post again slowly.
The game for me now isn't too complex, that's not what I wrote. I have been through a massive and I mean massive l earning curve which at the beginign felt near vertical. For the avoidance of doubt you need to understand the journey I went through.
My post is about the depth, breath and complexity the game has at end game legion at all levels and areas of the game. You can pick your topic from the auction house with sniping add-ons, to class min maxing, mythic+ and raiding and everything inbetween plaging at a level you wish to play at. This isn't a game to can pick up today and self learn, or in my view play solo at all. I had friends in a very good guild answer my continuous questions and spend hours teaching me.
Now, read slowly. If BFA builds on legion as it is with MORE complexity new players won't pick it up and the player base will shrink naturally with no new players or subs joining to sustain the platform and game. Old players want more spells, talents and higher skill cap and little change naturally, I am one of those people too.
But pruning is needed to simplify the game, bring on new people easily, give them a comfortable starting place to join in and then build up again.