Search filters would be nice, if the tags were not of such poor quality. A few years ago I prepared a table of about 25 themes vs their tags. Admiring my result, it took only moments to notice many existing features were untagged (e.g. a theme with footer widgets but not tagged for that).

Looking at the current list of filters terms I see the list has been thinned out. I suppose someone hoped this would improve the quality. I don't think so.

I think the filter terms do not provide nearly enough detail. Why is there is a tag for "footer widgets" but not for "header widgets"? There are tags for "left/right sidebar," but what if I need 2 right sidebars, or 3? Some themes do have multiple sidebars, why no tag? Should I care about "custom colors" when I have easy access to CSS?

The theme previews are useless; mostly showing stuff that is easily changed via Customizer or CSS. Why not provide links to sites using the theme (this could be automated so to require no maintenance) or have the developer provide an example (most already do on their own sites).