You're kind of saying "look over here!" but I'm not that easily distracted. You said "Which will also become a historical artifact as new protocols are made to use little endian". It's never going to become a historical artifact in our lifetimes. As the peer poster pointed out, QUIC itself has big-endian header fields. IPv4/IPv6 both use big-endian at layer 3.

The OSI layer model is extremely relevant to the Cisco network engineers running the edges of the large FAANG companies, hyperscalers etc. that connect them to the internet.