I've never done this. The only time I've ever done this with anything is with a firm partnership/corporation agreement since I never hand the keys over to anyone unless we are in business together (or married, etc.).
There are FB horror stories of lost admin control because other "admins" have changed access (and you can't get back in)... True? (in some cases) Worry? Not for me, I don't give people a key to my house, though I let them come in to par-tee from time to time.