Holmer's video informed my decision to subscribe to Kagi after playing with the free tier. The "Academic" search option has helped somewhat with more technical searches but if I look for anything on commercial software like MS Office, it is slop city (or at least content farm junk.) I think Kagi does better than DDG, my prior default and Google is so far gone I don't bother comparing anymore. Kagi has been a good investment so far.
At home I have uBlock Origin and uBlacklist installed on Firefox and Orion (Macbook) which helps me get more out of Kagi. When letsblock.it was active, I benefitted from the community-supplied sloplists for uBO. I found one for uBlacklist and am on the hunt for more. Community-sponsored lists seem to be the way to go but as with so many things, a few people will burn out supporting the vast many.
My problem is worse at work. Large company, Windows, locked-down PCs and browser choices, no extensions allowed. I am blocking sites right and left on Kagi but am aware of the 1000 site limit and no wildcards. For example, I think any site with "geek" in the title is 99.5% likely to be trash but unless I have uBlacklist, I have no way to block them all.
I think we'll wind up having to use AI to detect AI but danged if I know how to implement it.
Finally, I would like to compliment @dysiode. I've been online for nearly forty years. That post reminded me of the old Usenet where people wrote careful, detailed posts on their issues along with what they tried and possible options. That is very rare these days.