It (purposefully?) doesn't find everything.

For instance (this is just sequoia, but same for ios) searching for "improve" finds:

"improve assistive voice features" (I turned it off)

and diagnostic & usage data with: "improve siri & dictation" (I turned it off)

but under spotlight, it doesn't find "help apple improve search" (I turned that off too)

There are reasons graphical interfaces exist. Otherwise why don't we hide everything behind one single search box? And unless you are a die-hard Apple fan, you may not always know the correct feature name to search for.

Normally I'd say that's at least somewhat valid but Apple also has a nasty habit of coming up with new names for things everyone else had a name for for 30 years already. Then they do bizarre things like when I tried to help my mom with her airpod settings the other day - searching "airpod" gave no hits. I mean...what?