In the many years I've been here, this topic has reappeared many times. This is definitive. It also gives cred to the idea you can install them dry. And a reason to install them dry is so you can get them off cleanly if need be.
I still use gasgacinch on one side to position cover gaskets, but I'm confident I won't have to do them over. Had I made a mistake on the cam cover gasket, I would have regretted that. (Well not me as I have a frame tube kit, but you see what I mean).
Same can't be said for head cheese and pucks.