Insofar as they are only “cleaning up” non-core races and monsters, no, this isn’t a good thing. It’s annoying because now the races and monsters in this book are no longer in line with what’s in the core rules. Yes, we’ll undoubtedly get PHB races and MM monster stats that are like these new ones in 50Ae but as you say, that’s two years away. I would have preferred that they save all these major changes for 50Ae instead of introducing them for some things but not everything as a sort of advance preview / experimentation.