I think it depends on the context. Calling me a full stack is an acknowledgement that I can work on every step of the system and usually every part of the system. I don't consider it to mean equally good.
However if it keeps getting brought up when I am not supposed to be working on those other steps, that signals to me that maybe they are trying to push more work into me that I shouldn't be do.
I can appreciate that when someone says "Our X Expert". It definitely feels like more praise and more value.
It was showcased in Sony State of Plays (what felt like) most of last year but it didn't really wow anyone from them other then existing Helldivers fans. Even if a game is what people want, someone has to play it first to spread the word. Among Us is a great example of that.