If I search for “foo”, I’d like to get all files containing “foo” please, without a shadow of a doubt that some files were skipped, including those that I have recently created. I still can’t get that as of Windows 11!
It would be easy to have your cake and eat it too. Have the file search default to the index. Allow frustrated users to then click a button that says "search harder" which would initiate the full enumeration of the relevant filesystems. Of course some UX professional will tell me I'm wrong, they don't like anything they didn't think of themselves.