When can we expect Room with a stable KSP support? I see it's already been integrated. Is there any roadmap for that?

this is the parent issue (and blocking issues in nested) https://issuetracker.google.com/issues/160322705 We don't need to solve all those blocking issues. In fact, after this one gets in: https://android-review.googlesource.com/c/platform/frameworks/support/+/1844471 I think we might be able to call it non-experimental.