It should be very obvious that this wouldn’t happen here, I’m quite surprised you ended up with this conclusion.
It’s rather more variety in matchmaking than easier matchmaking. You still get matched by power score, just in a less punishing way. There’s several 10k players within your power range, no need to keep picking the ones with teams you just lost several times to, pick some of the others for a few fights.
White noise. I seriously doubt those weaker players would notice (or even care about) a tiny increase in their defense teams getting picked. You seem to be thinking in binary terms here, that’s not how statistics work.
Again, this isn’t a binary toggle. Uniform strong defenses would see somewhat less invades from players repeatedly not successful against them. There’s still plenty of other players around to invade you, those not losing every fight and those returning after getting offered a few different team compositions with same power score in between.
Quite amusingly, there were always enough enemies to offer, the match maker just didn’t look very far. Which is very similar to the issue at hand, not enough variety. It’s not very helpful that the match maker now digs up more players with the same defense team, it needs to look far enough to find distinct teams.
Not quite, it rather says that if you are fielding the meta grief team of the week, it will get picked slightly less often than an equally successful, less ubiquitous team would.