TFTP is probably the exception to that rule. All the other protocols started out easily enough and added more and more cruft. TFTP stayed the way it's always be

TFTP is probably the exception to that rule. All the other protocols started out easily enough and added more and more cruft. TFTP stayed the way it's always been - minimalist, terrifyingly awful at most things, handy for a few corner cases. If you know when to use it and when to use something like SCP, you're golden. If TFTP had gone the way of SNMP, we'd have 'tftp <src> <dest> --proto tcp --tls --retries 8 --log-type json' or some horrendous mess like that.