One complaint I do see quite often in Amazon discussions is that there aren't enough font sizes. There have been just eight sizes at least as far back as the K3 and they haven't added any more even on the high-res Voyage.
The steps from the first through the sixth sizes are reasonable but the last two are enormous jumps. A lot of people who need large print say they'd like several smaller steps after the sixth size.
I like bookcovers as sleep screens, book title at the top of each page (yes, I do sometimes forget what I'm reading
), page x of y total pages at the bottom of the page, and lots of empty space. I have both Kobos and Kindles but I'm much more attached to the Kobos.
