I know that’s the point, but I also know some people care more than others. I happen to be one of those who cares a lot.
My next device will be no heavier than 200 grams, and will not have a metal backing.
Do you mean the e-ink part? That is for natural-light readability w/o requiring backlight, and for power-efficiency w/o requiring a heavy battery/frequent charging.
In practice the color isn't great, the screens are slow to refresh in an annoying way, and the resolution is a noticeably worse than an iPad. I also find that apps not explicitly made for e-ink are generally garbage when used on an e-ink device.
So far I have personally been incredibly disappointed with e-ink devices outside of e-readers. I want them to be good but the experience is just so much worse than an iPad.
Maybe if you wanted to read comics that only ever had mediocre artwork?