You seem to mix up a lot of stuff here. The Tor Project thinks TLS for onion services is unneeded because they ARE end to end encrypted by design. The address itself is an ed25519 public key. And exit nodes are not involved in connecting to an onion service at all.

For connections to the clearnet it was always highly recommended to only use TLS and recent Tor browsers have now finally enabled https only mode that displays a big warning if you try to connect to a http server.