I do want a bigger phone at some point than the 6" I have now. But, I will say, when I read, it definitely is me using the same top of the screen all the time. I'll literally open notes in split screen even if I don't intend to write, just to reduce the reading area. To an area considerably smaller than this tablet. I don't want to have to move my eyes so far up and down. Having two or four or ten times more words on screen doesn't feel like it helps me to actually read.

(There is some benefit to having having a "shape" of the page, in terms of remembering where you were at a given point in the story sometimes, but that fades fast.)