If I control both sides of a connection, is there any reason to support alternate cipher suites?

If I control both sides of a connection, is there any reason to support alternate cipher suites?

If I have a system where I have 100% control over the client operating system and the server operating system, is there any use case for enabling more than one cipher suite (or any of the options that something like openssl will let you configure)?

Given the fact that I want to take advantage of processor extensions in AES and want to avoid that recent terrapin attack against chachapoly and cbc, is there a use case for falling back to another suite if I know that the one I choose is going to work?