For me it's my AirPods launching the Music app, something I rarely want. At the same time, it's one click in the menu bar to disable noTunes in the rare circumstances I want to use the Music app.

It's made worse by the fact that I use my AirPods across my personal devices and my work Mac, the latter of which I have to switch them to manually (since my work Mac is not on my personal iCloud account).

Anyway, however it happens, I often found the Music app launching on my personal and work Macs, and noTunes prevents it.