So you lose functionality without an app.
The soundcore open source app allows you to pre-pair a bunch of devices, they then show as a list and you can pick two with the toggles to swap your earbuds to different decives on the fly. It skips the repairing steps. I.e. I have multiple computers at home (work system and home system), and a work phone and home phone. It is handy to swap from meeting, music, or phone calls