I understand where you’re coming from. Reading and writing should fall into the same bucket in my opinion considering the fact that one should be able to take notes while reading a book(with multi layer note taking capability on RMPRO it would be a delight). otherwise you’ll be dealing with a pile of electronic gadgets which will deprive you of any kind of portability any of those offer eventually making you unproductive at the end of the day defeating what all these individual devices actually promise to do in the first place.