Ah, so uBOL does have the ability to adjust the blocking level on a per-site basis, which is what I assumed "per-site switches" meant. I see now that the original uBO has/had a more granular level of configuration available. (Which I suspect most folks never used, but still... my bad there.)
The biggest are that not all filtering capabilities are supported in MV3 and that the filter lists are only updated when the extension itself is updated. More details in the uBOL FAQ:
IIRC Finder has an option to delete files from the Trash 30 days after they're put there. I just enable that option and forget about the Trash completely.
I work at Automattic, but not on Jetpack Search. I can see internally that you've already written to our support staff, and they in turn have our JPS engineers looking into this. We should have an answer for you soon.
This app is hardly better than what you describe though: you still need to install it on all your devices and configure it. Seems hardly any easier than just downloading a pre-made profile from the repo I linked above and installing it. shrug To each their own I guess.
https://chromewebstore.google.com/detail/ublock-origin-lite/...
I don't use a ton of custom filters or rulesets though, so YMMV.