When does my wallet slide slightly from the magnetic center and then back into place most often? When I’m getting it out of my pocket.
When am I trying to just use my goddamn phone the most? When I get it out of my pocket.
So, it ends up being that ~50% of the time I need to use my phone, I have to wait for that goddamn 3 second animation first.
If some engineer introduced a 3 second regression in the time for Face ID to unlock your phone 50% of the time, it would be noticed and fixed immediately. But call that 3 second regression a “surprise and delight animation” and suddenly Apple designers love it and force it on you.