Comment by tristor

What you're talking about is a property called "forward secrecy". There are new techniques which have better quantum resistance for handling key exchange, but I think the point of the person you're responding to is that if you rotate keys often enough that forward secrecy may not be as essential of a property. I would say whether it is or it isn't is largely dependent on your use case and threat model. Either way, if the symmetric keys used for the session aren't directly breakable and you are using PQC for the key exchange, you can still enforce forward secrecy in a way that is only strengthened by rotating keys often.