I don't mean that something like TLS should support every type of crypto under the sun. As you say, that means TLS is only as secure as it's weakest component.

I don't mean that something like TLS should support every type of crypto under the sun. As you say, that means TLS is only as secure as it's weakest component. What I mean is that if I make a new protocol, it could use a different type of crypto from what is in mainstream use, so at least this new protocol will fail independently from other protocols.