Comment by nickelpro

You've already rejected elsewhere in the comments the style of problem these calculators are used for as either "more complicated than a high schooler is taught" or a "your teachers have wasted your time".

Which is fine, you have an idiosyncratic view of modern mathematical pedagogy (at least as it exists in the US). When you're a high school math teacher you can argue with your state dept. of ed. about it.

These calculators are also used at the undergrad level, fwiw, so the "high school level" (whatever limit you're putting on that, many high schools will accelerate students into undergrad stats and as far as Calc II), is not a factor in their use overall.