Earlier quoted context omitted.
I'd wager that the whole modus operandi for desktop environments is not made with e-ink in mind. E-ink fits in a situation where only a few updates are ever required, and completely breaks down for anything requiring higher framerates. The market might just not be big enough to warrant creating a product.
But it was. 90s laptops had a refresh rate comparable to e-ink. That's why the windows mouse cursor can be configured to leave a trace.
so the old is not so old, and the new is not dramatically new.