Not exactly. When it comes to calculations that could be super unreasonable and impractical to do by hand (think multiple exponents on a number, or cosine, sine, and tangent as simple examples), they help reduce that tedium in the overall process of what you’re trying to do. There comes a point where it’d be absurd to do certain kinds of math by hand primarily. I’m not largely math-oriented, but even with calculators one could understand the reasoning behind certain concepts despite using a calculator to work through them. People who take calculus can understand it but still use a calculator.

To have a calculator to do your times tables instead of knowing them, or any basic stuff in the four units would be detrimental I feel, because you’d benefit in knowing those up front, and how to process them mentally.