I feel like mosh is fixing problems at the wrong layer. Instead of making application protocols connectioness, we should make Mobile IP work so that connections don't need to be broken in the first place, or, failing that, separate the protocol management from the session persistence system.

Combining regular ssh with screen has worked fine for me for years. Why would I want to switch to something with a much shorter track record for security?

(By the way: if you want a line-buffered ssh for use over bad connections, run ssh inside Emacs with M-x shell.)