The babyrage over 2v2 had nothing to do with maps but rather some dudes not understanding long term benefits because their points got nerfed. Also not sure how it can be considered fucked when it made 2v2s go from the most unpopular game size to about as popular as 1v1 when controlled for player count.
I don't understand the arguments about sentons because the pool that sentons will be in will be a pool that is essentially pure 20x20s that play like sentons. You're going to have selkie. You're going to have beetles. You're going to have Requisite. You're going to have Metir. You're going to have huge wonder. All of these maps involve dudes that if they collapse, the game runs the risk of being over. The only thing about sentons is that it has a more refined meta, but that has such a small impact on long term rating when it isn't guaranteed to be in every pool nor is it ever more than 1 map in the pool. Not to mention a lot of the dudes that really go hard on sentons pretty much never play anything but sentons so I doubt they would even use the matchmaker anyway.
Also, there is no 1k rated dude that plays like Tagada. The dude will have a more refined build that gets him ASF out quicker, but he is still a 1k that thinks having more ASF means he won his lane and doesn't help his navy with torps or actually abuse his air advantage.
To me it's the Open Palms or Badlands of 4v4 TMM, every old dude has 10,000 games on it and knows exactly where and when to send engies. So I lose my first couple games on it. I watch replays, I learn, and with every game being less and less efficient at making you better I eventually get to a "good enough" level just as how all new players can eventually catch up to old players.