My fingerprints are almost unreadable. The professional at the National Guard CAC card office took 40 minutes to get a good enough biometric read of my fingerprints to store on the card. A biometric safe would be a disaster in my house. I prefer the 5 button combinations. They are user settable and can include pairs of buttons as one of the 3 values. I can do it entirely by feel in a dark room. I'm unlikely to be surprised with a first warning from a Ring camera and a 7 dog serenade reacting to any disturbance.
There are no little hands in my home now. My youngest son is 35. No grandchildren or visitors. We still keep things locked up safely for the infrequent cases when an HVAC repair person is allowed inside.
Re#33. There is a gun shelf that drops when you move its opening mechanism across the top of the shelf and the bottom opens. No biometrics.