Purely hate-based posts like that - "leave -> don't play ->we don't miss you" - are nothing you invented. It's the typical response I've been reading since the TBC years whenever someone had constructive criticism against the current implementation and die-hard fans of the current implementation felt threatened and couldn't answer with actual arguments on gameplay and resorted on personal attacks.
The years went by and the "then don't play" followed another "then don't play" and yet another "then don't play" and guess what: people stopped playing: the game was eventually 10% of its players in a world of 10X more potential players.
To say it plainly: throwing hateful "then don't play" are empty attacks that change nobody's mind and improve nothing in the game.
If you want the betterment of the game you either criticize it or answer on criticism with actual on topic arguments.