Not saying everyone needs one, but my oldest is in advanced classes and once they figured out how to do it on paper they moved to using the calculator to speed up the follow-on steps. It’s a tool like any other - you either learn to use it or you don’t.
Of course I had an older one that she used for a while - until I needed it back. (thought I’d have a mutiny on my hands for a bit there)
I’m a proponent of the Saxon math series method of learning math - you practice, and practice, and practice. So I don’t plan to let my kid use a calculator at all for arithmetic, but once she’s in Algebra and the problems are about more than adding up numbers, she’ll get a calculator. And no graphing calculator at all - if we get to calculus at home, like I expect, we’ll get access to MatLab software or something similar for really advanced problems that you can’t do on paper.
But I have the luxury of doing it the right way... lots of kids are just stuck with whatever is easiest for their teachers.