Recently I made a mistake of linking aadhar to my hdfc bank thinking it could help me change mailing address online without visiting branch or providing address proof for current/rented address.
This hdfc expressway is most useless, it just authenticate aadhar using OTP and fills both permanent and mailing address from aadhar and doesn't even allow entering different mailing address. What's the use of this? It's only usefull if a person changes the address in their aadhar which i dont think people keep doing every time they change their rented place.
And regarding locking biometric, it might sound good but it can turn into nightmare.
Just a year ago, my second mobile number just stopped working due to problem in sim card itself. Went to Airtel shop, they did biometric and gave me replacement.
What if, biometric is locked and suddenly the number used in aadhar stopped working for some reason? No OTP to unlock and cannot do biometric too. So basically done.
Phone getting lost, stolen, etc are different but sometimes even sim cards develop some issues.
Aadhar is one of the weakest authentication and ID ever produced by a country and that too linking with payments is just idiotic.