Spaces also allow for pretty nice access controls. So that you can prevent most cases of bots just collecting all history. And because you can nest spaces, it

Spaces also allow for pretty nice access controls. So that you can prevent most cases of bots just collecting all history. And because you can nest spaces, it also allows basically ad hoc organizing. For example, on a open source project you could have a top space for it itself, then subspaces for contributors, users, code reviewers and such. In the code reviewers space you could then have one where confidental issues can be discussed.