I am not going to say that you are wrong. Make your own choices.
For words to be useful though, they have to mean the same thing for the person sharing them and the person receiving them. Definitions matter.
In the Linux community, “stable” means not changing. It is not a statement about quality or reliability. The others words you used, “buggy” and “broken”, are better quality references.
Again, you do you. But expect “the community” to reinforce their definitions because common understanding is essential if something like Lemmy is going to work.