What if I delete a crypto wallet that still has a bit of crypto in it? For example, will the Bitcoins left in a wallet I would delete disappear forever, never to return into cirulation? (I actually did this a few times already, except that they were accounts of crypto faucets....)
Yes, you can delete your Bitcoin wallet whatever you want but it will never delete the address that you generated on the blockchain, it will remain there, and also your balance will be traceable on the address that you have generated.
I tend to agree above, this is like burning coins that never access or something you forgot the keys and never access, or when the owner will die and the wallet can't access by anyone. This is the same scenario.
If you're afraid of being hack or afraid that you are using crypto, you can delete your wallet but if you want to get it back, you can keep the key and password in any place that you can have access, time will come if you need it, you still have access. Of course, a wallet that has the open-source feature.