And yet it's been improved upon. IMO, SCTP offers a superior set of features. TCP wins on ubiquity and SCTP loses by virtue of not making it past firewalls/routers configured to drop traffic that's not TCP/UDP/ICMP.

Uhm. There's plenty of downsides to TCP/IP. It's just very very hard to replace, to the point of not being worth it. Take a look at something like QUIC for an idea of improvements.

Ewww, that's ages old stuff. Nowadays we use JavaScript. /s

You joke, but there are lots of Node devs using websockets in simple CRUD interfaces simply because "HTTP is too slow".

WebSockets? That's so-o old fashioned. All the cool guys have already switched to WebRTC!

Bad news: I'm obviously kidding here, but it's based on a true story.