My mom had this on her previous Acer laptop and it's on her new Asus laptop (didn't buy it because of it).
I tried it on her previous Acer laptop, could login with a finger scan, never used it permanently.
Nice feature but she doesn't use it.
I also think it's risky to use it since your fingerprints can get "damaged" from work/household work, winters-summers etc.
On laptops there is a failover in most cases. I had both Acer and LG laptops with fingerprint reader, and both were based on AuthenTek capacitive reader.
The built-in software makes multiple scans of all 10 fingers during the initialization process, and you can log-in with either one (tested - works). Basically, if you cut/burn/lose one fingertip, you can always use the other ones.
I am not 100% sure, but you may be able to log-in with your toes =)
There was also a crappy, but interesting fingerprint-based password manager.
But who would store their biometric prints on an unsecured device? It is better to just use NFC chip or something like that that autmatically unlocks the system in proximity.
I know that old laptops with capacitive readers work in conjunction with TPM to encrypt data. Not so sure about phones.
NFC and Bluetooth are vulnerable to spoofing.