The idea is to use a multi-key FROST npub to allow you to add and remove keys for each device/app that you sign up. In that way if that client misbehaves and leaks your key, you can rotate that client's key out of your FROST setup
Discussion
I dont follow/understand what any of that means to be honest :/
(And i dont mean i dont know/understand FROST, i do; its just what you are saying does not make sense to me)