tracker-miner (not minder) is used to index files for various uses:
- It's leveraged by applications such as GNOME Documents, GNOME Music, GNOME Photos for quickly "discovering" associated content (PDFs, docs, etc. for Documents, music for Music, images for Photos). Without tracker being enabled, these will not function.
- It is currently lightly used by Nautilus, but this is purely because we have an older version for desktop icons. Once I implement the desktop icons view for Budgie 10.5.2, Nautilus will be upgraded and as a result, Tracker will be more heavily used there (for search and batch file renames). I don't like it either, to the degree that when I actually have the time to sit down and work on even more projects (so, I gotta clear out my current workload first) I plan on writing a file manager.
- Before you ask, no I do not care about other file managers that already exist. No I don't care about Nemo, Caja, etc. Search our Reddit and our forums, I've explained this on multiple other occasions 😛
- Tracker is used by GNOME Shell. Doesn't affect your Budgie usage however, since there is no relationship between Shell and Budgie.
While you are obviously welcome to do whatever you want with your system, just beware that by disabling tracker, you are effectively opting out of any sort of support that I'd provide you for use of the GNOME stack and its applications. You're effectively using an unsupported configuration.