Why not have the insecure or interceptable protocols as optional protocol extensions and make everyone happy? Much like with fips and how you can build openssl

Why not have the insecure or interceptable protocols as optional protocol extensions and make everyone happy? Much like with fips and how you can build openssl and other tls libs with fips mode on or off. TLS 1.3 client libraries could then optionally support interceptable key exchange depending on who is using them. An individual can use normal OS and distro that exclude the insecure features while banks and military facilities might turn it on. Alternatively,why the "one size fits all" approach? Why not have a "TLS-commercial". Obviously the "one size fits all" requires a comptomise by all parties resulting in a collective reduction of security.