Matter has been pretty good to me lately. Had to solve an Apple Home Hub issue, but it’s pretty rock solid now. My only complaint is switches could have less latency (I want near instant), but at least they are working consistently. I’m using Matter over Thread, not Matter over WiFi.
Also you need to pay (18k/year iirc) in addition to that as well. Next to the fact that matter itself is quite convoluted from an implementation standpoint.
It’s really not made with things like startups or niche products in mind. It’s really a standard by and for the big companies