I don't think that statement is fair. Yes, they have problems with the software and they are pretty slow to fix them, and they deserve criticism for that, but to say the software is not usable is too harsh (except for the 120II, but this has only been available for a few weeks, not years).
I have used the software from the start, and i could always use it and work around the quirks. Sure, it is not as reliable as i would like it, but if you don't try using it every day as a monitor controller it should be ok to do the setup. BTW of course it also works if you don't use a perfect equidistant triangle, it's just not recommended. It works the same as Dirac in this regard.
Yes, it is not designed to work with
@enricoclaudio 's Rhythmik-subs. Everyone taking the MA1-road is unlikely to buy some of your subs. But because of that, you are IMHO not neutral in this matter, that's why i speak against you (again).
You are right, of course, that the MiniDSP offers some advantages over the MA1. I tried both MA1 and DLBC, though, and the MA1 has some advantages, too (comparison:
https://www.audiosciencereview.com/...live-bass-control-dlbc-dual-kh750-subs.43054/).