I would like to highlight one of Brinzan’s comments in the Trac, with which I agree:

“Address the whole issue instead: improve the directory, better theme tags and search, implement the things that we have been waiting for 10+ years.
Multiple screenshots, descriptions with markup, better readmes, links to documentation and maybe even custom demos.
With all these in place, both classic and FSE themes will have all the necessary tools to attract their target audience.
If this many Automattic employees (with 0 themes in the repo) are so worried about the state of the themes repo, then maybe a few resources could be allocated to improving the whole system.”

Spot on.