Your hand contacts your face to the same extent using a deep hook as it does shooting off your fingertips, using a corner of the mouth anchor.
When I shoot a light bow, I shoot off my fingertips, as it gives me a cleaner release. When I shoot a heavier bow, I use a deep hook, because I couldn't relax my hand if I took all the weight of a heavier bow on my fingertips. I sort of make the adjustment of how much I tilt my head automatically, just by being aware that I need to keep my eye over the arrow no matter what changes I might make in bows, shooting gloves, or finger position.
I can see your point, your curled fingertips have to go somewhere when you shoot. Do they push your face aside, or does your face push the fingertips aside, or is there enough give in your cheek and lips to absorb it? As a practical matter, it doesn't seem to make any difference, perhaps because whatever moves moves consistently from shot to shot.
As a person who also ponders these things, you may have narrowly avoided giving me something new to worry about. I say "narrowly avoided" because since I have switched from a corner of the mouth anchor to a double anchor with my thumb knuckle on my earlobe and my nose behind the cock feather, my fingers now don't contact anything and so have plenty of room to uncurl (if they needed any).