A lot of people prefer community servers and want Valve to outright remove matchmaking for reasons like

No team switch on matchmaking

shorter game times outside of control from players

end game map vote instead of near when the game ends (which also breaks randomly)

matchmaking putting you in a match right before it ends

MvM matchmaking being outright broken

The infamous Matchmaking Error: A connection to the Steam VAC Servers could not be made.

I personally think these problems can be fixed by Valve without the need to remove matchmaking alltogether, but i agree that the way Quickplay used to work was better than what we have currently.