One of the things banks do is to issue loans. That's fine.

Another thing banks do is, Alice is in New York and wants to pay Bob who is in Miami, or Kyiv, so instead of getting on a plane with a sack full of Benjamins she tells the bank to send money to Bob. Cryptocurrency is clearly an alternative way of doing this, with the advantage that then there is no middleman to refuse the transaction when the bank is being leaned on by a despot.

Bitcoin can't, but defi can. An entity can issue a ERC-whatever token that acts as a bond, minted in exchange for whichever other token (e.g. ETH), and redeemable for that plus interest at their discretion (e.g. you could create a redeem queue). The bonds can be traded in secondary markets immediately upon creation - no need to file for listing (you need to create a swap pool and seed it with a little of each asset though).

An important difference is that your new token can't ever be confused with base money. In banks, we have base money, and we have bank money, and we pretend they're the same thing because banks are pretty reliable (not 100% but pretty). In crypto, the system won't let you lie like that. (Though you can create another new currency backed by a mix of currencies - this is what DAI does.)

Another important difference is trust. I can easily issue bonds in the real world and then just run off with the money and not repay them. If I try, a lot of heavily armed men will hunt me down. That doesn't really happen in crypto, and as things are now it can't happen, because if you make your identity and location known and issue crypto bonds, the same armed men will hunt you down for issuing crypto bonds instead of ordinary bonds, which is a crime itself (see what happened to Kik/Kin). So you'd have to stake something else to make people trust you.

> The primary purpose of a bank is to issue debt. That’s why they were created

Yes

> A bank has to be able to “print” money to issue debt

Absolutely not, especially not in the context which you just said ("that's why they were created"). When the banking industry started in various Italian city states, money was state issued and backed by precious metals, and banks didn't create any new money supply. They gave loans, invested, kept deposits, etc. but without touching the money supply, which was managed by sovereigns and sovereign states.