Three reasons:
- Banks fubar safe deposit boxes all of the time, in a variety of ways.
- Once the bank figures out that you’re dead, it’s sealed without a court order.
- As you get older it’s more likely that you’ll screw up payments, lose keys or codes, etc.
Also, the attorney will advise your loved ones on what they can do. For example, you need a power of attorney for many things.
https://www.nytimes.com/2019/07/19/business/safe-deposit-box...
Despite the issues, there are still valid uses for a safe deposit box. I live in a highly fire-prone area and keep a backup drive with family photos and documents in a safe deposit box in a local place that won't burn when I do.
https://abc7news.com/archive/8973198/
Note the police are not classifying this as a criminal case (theft), but a civil case.
Which is why you need to put a tamper-proof box INSIDE a security box in a bank. Key to that box will be in your house, far away from bank personnel.