They are using the term "machine" and "process" in multiple conflicting meanings I think. I mean maybe they improved this since I used it 1.5 years ago but I kind of doubt it.

If I remember correctly there is a definite problem if you remove one of the processes that end up guaranteeing your configured redundancy mode. So then suddenly your entire cluster is inoperable. Yes really, I think it doesn't even properly respond to cli commands anymore and shows nodes as simply missing. Oh and suddenly those long wait times for your cli commands are really starting to bother you... I don't really want to talk more about it because it's been a while but I just wanted to make the point that the user experience was quite bad.