You complain about SDP and about RPTTransceiver. But RTPTransceiver comes from ORTC, which was exactly introduced to avoid messing with SDP all the time. And yo

You complain about SDP and about RPTTransceiver. But RTPTransceiver comes from ORTC, which was exactly introduced to avoid messing with SDP all the time. And you need it to specifiy simulcast layers. You don't need to use it.