Theme review cycle and acceptance criteria

I was reviewing the recent pull requests in the theme repo today and was wondering what the criteria for reviewing and accepting a theme is?

I see a recent merge of a theme added 3 days ago. But there are dozens of theme submission pull requests that haven’t been reviewed for months. I recently submitted my first theme and I’m wondering if / when it will get added to the showcase.

Are the pending pull requests somehow insufficient to be showcased on the official themes site? If so, why? Why did this particular theme take precedence over the ones laying dormant for months?

I understand the maintainers are busy but it’s not exactly welcoming for theme creators when you contribute to the ecosystem and it gets completely ignored.

Please don’t take this the wrong way. I’m simply curious why so many themes are pending review. Some of them may be great themes that no one will know about if they only search on the theme showcase.

Thank you for your help.

Bumping this