we have fingerprint from bks. learning works like with elina, learning is theoretically possible with the remote control, if one knew the id. so basically, all fingers would have to be deleted. but when does one actually delete a finger?! sure, for vacation neighbors to water plants or something, but otherwise it's rather manageable.
pin is, as mentioned, not so great security-wise, only has to be glanced at once by someone. and you don't change it constantly anyway, so stop making excuses. radio is like with the car, a matter of concern, but it can be done. I basically think it's a good idea, I could imagine it too. fingerprint is probably the best security-wise, since no one copies the finger and wants to fiddle forever at the usually open and visible front door.
the advantage of all these systems is definitely that the front door is automatically locked in a way that's effective for insurance purposes and you don't have to lock the door yourself. of course, in case of a power outage, you can still unlock the door with a normal key, which also means that the front door could be opened with a key replacement (lock pick ^^). so you would need a lock with a secure key profile.