I own one of these

Primary use case is I like having the history there on the screen, that persists between power cycles, and the backlit screen. Being able to graph stuff is neat but unused by me. Also the casio graphing calculators have spreadsheet functionality now, which is nice for crunching a couple of variables to find the correct set that arrives you at the target number.

It's also way more durable than my smart phone and I can leave it in the garage for weeks and weeks next to the drill press and it's still there with the last 20+ calculations I did on it, when I get back.