

I wouldn’t say I really care if the “community” is big or small (it’s also a bit unclear what you mean exactly, do you just mean user adoption?)… but I care about Linux (and in general, open source alternatives) being real options when it comes to hardware support, compatibility with services I might want to use, etc.
I don’t think you can have proper “progress” in those areas without having Linux be a recognized mainstream system. Like say… banks are unlikely to make an authenticator app for non-Android Linux phones if non-Android Linux phones are not mainstream, for example.

I had heard the “PostmarketOS” name in the past but it never sparked my interest, the name made me think it was an OS made for some old obscure hardware that I’m likely to not own or that I would not be able to buy anymore. Either that, or a distro meant for old PCs.
I just found out that it comes shipped in PinePhones and that it’s actually a modern OS not necessarily constrained by a specific line of legacy hardware.
I think it’s better a name with no implicit meaning than a name with a misleading meaning. All names are obscure when they just appear, I don’t think “PostmarketOS” was such mainstream name.