At this point I think that Valve is trying to make sure that nobody will ever play matchmaking again.
Like probably in the next update they will throw out Snakewater, Sunshine, Gullywash and Metalworks and add 2Fort, Dustbowl and Gold Rush.
I played matchmaking because once in a blue moon it could be fun, with good team and good maps. But no they threw out 2 of best matchmaking maps and gave us one map not suited for 6v6 and one just terrible map.
Valve are you listening?! People didn't want to play on Swiftwater and Gorge, Granary and Badlands were good.
If this happened 6 years ago, Valve could experiment with matchmaking, because back then TF2 wasn't dying and people would play matchmaking and give feedback. Right now there is no time for experiments like this because TF2 is losing players and nobody plays matchmaking in its current state, the best Valve could do is to balance weapons that are banned from leagues, fix all bugs and stuff and just take the ruleset and map rotation from leagues.
But they just have to test competitive formats themselves and probably they will test formats until nobody will play matchmaking or TF2.