Yeah, it’s a very slow and niche market (at least for android eink tablets).
I heard that color tech sacrifices on resolution. At least when I was buying my BOOX onyx.
IIRC I learned from technology connections that the refresh rate isn’t a limitation of eink displays, but rather a limitation of the processors.
This makes sense as most eink tablets use a cheap low power processor since you’re reading books you don’t need a high refresh
On a other note, I just realized I found technology connections because of his coverage of eink tablets