Do any Android users actually use face unlock? It always seemed like a gimmicky feature from the early days of smartphones when everyone was just trying to build up their patent portfolios.
Although the user is definitely compromising on security, the speed of face unlock is such that it is near-instantaneous. Double tap the display, and you don't even have to blink - the phone unlocks.
It may be a gimmick in the early days of Android (think Nougat or even Oreo), but it's definitely not a gimmick now, for me at least. It's fast enough to have proved its worth.