I understand the desire to disable Siri system-wide, but Spotlight? How else are you going to find your files?
I'm often annoyed how slow/unreliable Spotlight is, especially in Mail, but what's the alternative here?
I’m not a turn spotlight off guy but it is a bit of a pig in terms of apple’s approaches to system crawling and indexing and how it leaves its metadata detritus all over the disk. I can see the desire to disable it for some.
Id disable half - if not more - of default services. Thats why my next laptop will be linux.
Apple is not there yet, but kind of drifting towards becoming the new windows.
I use Quicksilver and I have Spotlight disabled.
Spotlight is much improved in Tahoe - faster and with better results.
Personally I store a list of my files, with tags, in a sqlite database. Granted, I have a lot of custom tooling to make that practical..
Store your files in a file structure that makes sense so you know where things are? I have never used Spotlight to find a file because I put files in sensible places.