Dasung actually make a 13" version of this, which I own and have used outside in Egypt a lot while I lived there. It's a VERY sunny country, and normal laptop screens are almost unusable outside.
My model is a few years older and things have probably improved since then (quality, refresh rate, interop with the OS to trigger things like full refreshes), but it was already fairly workable back then.
I also use a phone with an e-ink screen (Hisense A9) as my daily driver and it's quite nice, some software issues notwithstanding.