The iPad Pro has been marketed as a laptop replacement. I don’t know anyone who thinks it can do that, at least not yet.
However, it is a potential paper replacement.
I tried it with the Apple Pencil and it’s perfect. The handwriting is flawless, and best of all, you can just write like it’s an ordinary piece of paper. No need to adjust unless your writing style is so odd that it probably should change anyway.
It’s extraordinarily useful for a few types of people: students, academics, people who travel a lot, and sketchers/graphic designers.
It could very well fill the gap between LaTeX and handwriting for me, and if you’re a mathematician or in a STEM field that requires a lot of “writing on paper” work instead of (or in addition to) writing code, I highly recommend it.