Earlier quoted context omitted.
Calculators are not exactly premium devices, even though you'd likely think otherwise when you have to buy the anointed model for your kids' school. That said, Casio is probably churning these things out with a BOM around $5-$10, so you can't really expect much from the display. We're spoiled by our phones, which (weirdly enough) have no single, definitive "good" calculator on either iOS or Android (and can't be used…
Graphic calculators are extremely expensive for what they provide (compared to a cheap phone). Only thing holding them up is regulation (ie. being allowed in class and at certain exams), because otherwise, even a cheap phone can emulate a classical calculator (eg. hp 49g for us RPN fans), not to mention more advance tools (from apps to wolfram alpha).
Though maybe that’s just because nobody has come up with a great UI concept for a touchscreen calculator.