that feeling of existential dread that comes when you think you might have fucked up and lost all the money you just tried to transfer.

I still remember the BTC transactions back in at the ATH taking 1 whole day to be completed, the waiting nearly killed me of stress, was almost as stressful as sending money to coinbase that took 3 days to arrive... at least with BTC I could check the transaction in the blockchain (number of confirmations), with a bank transfer there was no way to know if I had sent the money to the right place and no way to know if the transaction was confirmed or not.