Those exists now, in the form of eink Android phone/tablet. The refresh rate of eink makes their experience suboptimal, but some find it usable enough.
You can search for Boox tablet, or Hisense A5 phone.
I know I shouldn't be complaining about price now that I've heard it exists at all, but $840 is really steep! I was thinking something more like $400. I know it's a niche product, but even so.
Monochrome is expected. Do you say it's slow because of the screen's refresh rate, or do pages take a long time to render?
I'm kind of eying the BOOX Nova2, which is in my price range at $340. The screen is 7.8", which is ~ 2" smaller than what I'd ideally want, but not by much.
It's interesting, but I really have no interest in a laptop I can't type on.
On a tablet, I just acknowledge that I won't be typing, and I live with it due to the form factor's other advantage (namely, it's easier to lay back on the couch with a tablet than a laptop).
Also Kingrow K1, although I'm not sure they're available for sale anywhere yet - I got mine from the crowdfunding campaign. It makes for a very convenient eInk reader with the corresponding apps installed (and it comes with Kindle out of the box).
Unfortunately, there's no Google Play Store on it. But that doesn't preclude web browsing with Chromium or Firefox.
None of those appears to be Android, which IMO makes them have less utility value. There's definitely pros and cons though, and one should research which is right for them.
Sure, the hardware is great. Depending on what you do, it's the software that is miles behind. The Android app situation is worse to begin with and Android developers pay almost no attention to big screen tablets because so few people have them. The app situation on the iPad isn't amazing, but it is better. I think Procreate alone is responsible for a lot of iPad sales.
Plus Android tablets are deceptively expensive. They aren't going to receive updates for as long as the iPad and when you sell it, the resale value is as good.
I know I shouldn't be complaining about price now that I've heard it exists at all, but $840 is really steep! I was thinking something more like $400. I know it's a niche product, but even so.