- Neutrino has zero to do with Lightning
- eltoo has zero to do with Bitcoin, there is no eltoo proposal for Bitcoin
- Segwit doesn't only fix malleability (which was desirable for all contract systems, not just Lightning)
- SIGHASH_NOINPUT has been suggested for use cases that are not Lightning
So, who is viewing protocol improvements only through a "how will this help Lightning" lens?