> "space" is just a common English term for this kinda thing

Isn't that exactly the problem?

It's like using "node" for something in your program's design, or "tree" or "type" whatever. Usually it's better to find a more specific name that communicates the intent even better, or at least less common name, as it'll inevitably will clash with something else, and by then you wish you'd name it differently than every other single thing out there. Unless it truly is only that thing which can be called "tree", don't suddenly call it "perennial" just because.

Not saying the word doesn't make sense, questioning it's use from a branding/identity standpoint. It's already taken/associated with an aspect of another network that like it or not is still in proximity to whatever AT proto/Bluesky are developing. Just call it something else! ("hardest thing in computer science is naming things" etc etc)