Its clearly not better, its worse. You exchange possible interest rates with a rather incalculable risk of total loss or some absurd insurance fees which are likely to be higher. If putting paper in a safe would be better then someone (probably the bank itself) would offer that as a service. If they cant make it lucrative at scale you certainly cant either.

Sigh, you made me regret responding to your initial question.

FWIW commercial banks have had negative interest rates for a few years now.

https://www.truewealth.ch/en/blog/negative-interest-switzerl...

You completely ignore my point and instead provided a proof for what no one questioned.

The regret only grows. Now I'm torn between trying to explain the concept of imaginary scenarios where the scope is limited and crafting a statement with a hidden insult somewhere.

If this were a party conversation, imagine me walking away rolling my eyes and shaking my head...