[mdp2021]

Some of us suspended the habit to look at the text while typing (on systems with latency), and look at the typed only periodically (off, on, off, on).

[sublinear]

I get that you're talking about situations like typing into a remote terminal, but this technique still causes eye strain which brings us back to square one with slow eink displays which are like this all day long.

[mdp2021]

I was talking chiefly about typing on EPD :) (Soooo many keystrokes, so many hours.) I personally felt no eye strain - it may depend on your ability to adapt into the process.