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.
Same with grafic tablets. You can't get around that. Which is okay – normal pencils wear down as well.
Have there been any that solve this problem?
+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.