Even without the advantages of e-ink, a display which one can view _anywhere_ is a compelling thing, which opens up a lot of possibilities --- my favourite Windows device was a Fujitsu Stylistic ST-4110 w/ a transflective LCD, which I used as my main computer, e-book reader, notepad (writing/drawing/annotating with a stylus), and map display when traveling.

The transflective display eliminated issues regarding reflection or the display getting washed out by even full, bright, direct sunlight (I would use it for reference material for building sand castles at the beach).

Unfortunately, transflective LCDs do _not_ showroom well (dim) and no one seemed willing to make the investment to show their capabilities (build a daylight-equivalent light booth on the store floor).

I keep eyeing a Daylight Computer, but these days, I just use a Kindle Scribe for reading and note-taking/sketching/reference, and I limit my activities when in full sun to those things which it can do well, changing location/finding shade when I need to do other things.

HannsNote2 looks amazing in the sunshine. But very slow processor and very low capacity battery. It’s a niche use case but great for a couple of hours of KOReader in the sun.

https://www.hannspree.com/product/hannsnote2

Are you familiar with Sun Vision RLCD displays? They seem to get good reviews. Not cheap though: https://www.sunvisiondisplay.com/