I didn’t say that it wasn’t. I was responding to the notion that “these features should be built into all conventional desktop terminal emulators.” There are reasons why it cannot just be built–in to the terminal emulator, and the best we can do currently is just to run some program like mosh or tmux on the remote side so that the terminal state is maintained correctly.

I suppose the terminal emulator could be more helpful though. For example, if you have a terminal emulator with local tabs/panes/splits/whatever, maybe it should orchestrate the process of connecting (or reconnecting) to the remote server. If I create a new tab or split the current window, it could connect automatically to the server for me. If it is connecting via mosh, then the terminal state in each of my tabs/windows/panes will be maintained correctly.