I'm speaking from an application level perspective (REST or GraphQL APIs and the like). Of course at deeper levels of networking there needs to be a concept of state. But the only reason I can think of somebody having to hand roll anything todo with TLS nowadays is that they are doing something very very specialized, or have gone down a very wrong path.

Though that did remind me, if you're doing websocket stuff I suppose there could be a considerable amount of 'state' to handle on the backend.