This topic actually interests me at the moment. I have gone from a 7.1 system down to a 2.1 system as I have grown tired of all of the cables, speaker wires, endless experimentation, furniture placement considerations and the rat’s nest behind the TV. I’ve also grown more fond of listening to music than watching movies. I really enjoy 2.1 for music and the more I think about it, 2.1 works just fine or my TV needs. It’s clear and immersive enough for me.
At the current point in time, I cannot imagine ever going back to 7.1 or 7.2.
FWIW... I’m amazed at the knowledge base and experience of many of the people on this forum.