As a matter of facts it is time to have a theme dir, I agree.
We do have themes for CP and people look for it.
The Dir already has a (not visible) section for themes, I am not sure what is missing to have it working, Wade will need to tell us when he’s available.
Theme review and submission standards will need to be written, in the same fashion as our plugin review standards all visible here Plugin Guidelines | ClassicPress Documentation
They aren’t going to be a lot different, but obviously need to be rewritten.
That’s partially already been done, see
Draft Theme Directory Guidelines
Draft Theme Directory Adoption/Takeover Guidelines
Draft Theme Directory Submission Guidelines
Draft Theme Directory Review Process
Draft Theme Directory Vulnerability Reporting Guidelines
So what we need is the DIR to accept themes.
This can unfortunately only be done, or at least exposed by, Wade.
I have created a task for him to review this when he’s available.