I do this with spaces too. But it occurred to me that I'm essentially abusing spaces to act like client-side folders/groupings of rooms.

Can you create a space that's only for "personal" use, if you are not an admin of your home server?

Spaces are a great feature, but I think clients will start needing to add grouping/tagging somehow, in addition.

Spaces are a superset of tagging. Just create a space (tag) and the rooms that you want to tag to it. If you want it to be just for you keep the space invite-only, if you want to share your "tag" you can.

> I'm essentially abusing spaces to act like client-side folders/groupings of rooms.

That's exactly one of the intended purposes!

> Can you create a space that's only for "personal" use, if you are not an admin of your home server?

Yes

To elaborate, Element even explicitly asks if you want to do that (even if I understand it correctly, it's the same as a private space without other members)