That's the point: if file systems that basic would NOT lose data, then it is unacceptable if another file system does.

Maybe to put it differently: new file systems should offer improvements wrt reliability for stable features of the file systems of the previous generation; regressions are unacceptable.

Yeah, when you get down to it the opinion really boils down to "the file system is broken iff it doesn't lose data for the use-cases I personally use it for."