I don’t use either projects or persistent history, so have no need for the database. I find it more convenient to just have the DOP files with all the edits, then I can transfer them anywhere I want, on any computer I want, at any time I want, without having to worry about conflicts and spurious virtual copies.
As for searching, I can use either my own DAM to find files by keyword, rating or Finder Tag, or Apple’s own Finder search for all sorts of metadata.
Not many yet as I am still working on additional features requested by testers.
But, as I said, even without my app, I can use Finder and the Spotlight mechanism to search whole hierarchies for very complex predicates that even Lightroom couldn’t do.
I see my app as a convenience that simplifies the more complicated, but comprehensive Apple UX for searching. It also allows me to easily add keywords, which Finder can’t do.
My main system is Windows, and I’m not a pro so every photo I edit for printing or preparing for a photo book I finish at the system I’ve started with.
My keywords I manage still with my local LR6.14 at windows system.