You'll have job interview clothes and printed resumes as part of every job hunt. That's just a part of the job hunt itself; there's expectations that you'd need those if you're looking for a job.

A basic calculator, without the ability to use an alternative, is not, and forcing someone to go out of their way just to get through your setup, meanwhile being treated like a cheating high schooler, is not going to make them want to work for your company.

I'm a grown ass man, I don't need to be treated like I'm going to cheat at an interview, especially when said cheating can easily be exposed in any sort of discussion or the first day on the job. Requiring a calculator is fine, but disallowing people from using basic tools they have available to complete the same task because of the potential of cheating (how can you even cheat on a coding challenge with a graphing calculator, anyway) is ludicrous. A 1 minute discussion about the code I just wrote can tell you just as much about whether I cheated or not as the arbitrary rules imposed here.