The refresh rate of the e-ink displays of certain smart watches surprised me. It was displaying fluid animations without any ghosting.

I'm not sure if refresh rate is a function of display size at all, but I will say they've come a long way at improving it over earlier Kindle modles.

If you're referring to the Pebble, that used Memory LCD, not EInk, and it's a completely different technology.

Scrolling would be a problem. But a good controller makes small text changes possible, even my old Kindle 2 can do small updates to the screen without having to do a total redraw.

Even just reading and highlighting on a Kindle Paperwhite, the refresh rate is painful.