but yeah tetsu doesn't have to if their bias won't let them. no skin off my back. fact: monero is more fungible. there is no need for a 2nd layer. and it would be a perfect sidechain for btc (ala liquid)

There is a key difference, there is 1-1 L-BTC to BTC which means L-BTC only exists with BTC. With monero it would be just a bridge to swap, which in fact would be selling BTC for Monero.