The thing with calculators (in the US) is that they need to be certified. You cannot release a new version of your calculator every few years due to this.
Which also leads to the option to have a piece of hardware still in store that has been out of date 10 years ago and still sells for the same price. I bought my TI-nspire, which was the second to last edition at that point for ~120 Euro. My first smartphone was the first widely released Android phone and it had more power than this thing.
Another weird bit I read a few years back is that a lot of (TI?) calcs do not have a keypad that follows qerty is due to the view that anything with a qwerty input is a computer. And computers are not allowed at a lot of those exams.
