Eternal Terminal pitches itself as entirely superior to Mosh, but also describes itself as using TCP (Mosh uses UDP). I'm curious how that can actually cover the use cases Mosh provides?

Mosh using UDP means that as a connectionless protocol, your end points can move (eg: from WiFi to LTE, or vice-versa), and beyond a small hiccup, your connections remain alive and well.

To add on to that, I use iTerm2 with tmux control mode which combines a native UI frontend with a tmux backend on a remote server, meaning I can spawn new native tabs, windows, or panes and they're all tracked by the remote so I can reconnect to all of them at once if I disconnect.

I keep one laptop at home and one laptop at work and can seamlessly switch between the two without having to manage my active sessions at all. If I open a new tab at work and go home for the day it'll be there on my laptop at home.