It must be heaven for Math teachers and professors. No more mounds of discarded paper. I'm sure they use tablets already, but the look and feel of writing figures on an iPad isn't as nice as epaper.
An iPad with a paper-like screen protector is very close.
+1. Plus an open access to the web with a choice of browsers is super important too! You can't do all of that with proprietary trash from e-ink––there's nothing good about physical paper (dead-trees) anyway to be promoting your product with.
This is true, but the paper-like screen protector market is a mess. I spent $40 on the official Paperlike 2, waited a month (preordered), applied it, and it was pretty bad. Not really like paper at all. Then I bought the knockoff-sounding "XIRON Paperfeel" for $15 and it was a vast improvement. Unfortunately they don't make one for the 12.9" iPad Pros with home button.
I've found they chew up the nib on the Apple Pencil as well.