[throwanem]

On the note of paper feel, you might consider trying a fountain pen and smooth coated paper. The ink forms a liquid bearing and causes the nib to glide over the page, and there can be almost no friction - by comparison, the reMarkable feels extremely rough, like using a hard pencil on toothy sketchbook paper. It's not unpleasant, but an iPad would actually be a lot more like using a medium nib on a sheet from Clairefontaine or Tomoe River.

(While we're making this sort of comparison, it's also interesting to note that, as with a graphite or Apple pencil, the reMarkable stylus tip is a wearing item, while fountain pen nibs are not.)

[therein]

iPad feels too slippery to me as is. I get one of those screen protectors that give a paper-like feel to make it more like what I am used to from Remarkable.

[throwanem]

Higher friction at the interface between tool and surface makes for easier control at the cost of requiring more force to produce a given result. That's why your hand and wrist get sore so quickly.

With a fountain pen or (presumably) an iPad with no screen protector, you have no choice but to learn to control the tool without that excess force - force which will eventually destroy a pen nib, and in both cases will ruin your lines because there's no friction to damp it. Learning not to overcontrol does take a little while, but pays off both in work that's neater and more skillful, and in being able to work much longer before aches force a pause.

(With the reMarkable, too, there's a benefit in that your stylus tips will last longer, and you'll get more nuance out of the pressure sensitivity with tools that make use of it.)