Unfortunately, calls with more than two people seem to fall apart quickly if the network connection isn't perfect, even where Meets, Zoom, etc. work flawlessly.
It was originally announced as an open standard, though. Anyone who remembers Steve Jobs would have caught on. It is easy for us old-timers to forget how long ago that was now, so I extend my apologies to the youngsters.
FaceTime is limited to Apple devices until iOS 15 allows anyone with a browser to join a call, so you’d think they’d be emphasizing the benefits of portability more.
https://www.theverge.com/2021/6/7/22522889/apple-facetime-an...