[windowojji]

The problem with this is that schools tend to very specifically teach TI calculators while leaving other calculators to the children to self-teach.

This is fine if you're a kid who likes/understands/cares about calculators, but if you're not and you don't like math or find learning a specific UI with no guidance annoying it can be bad. I knew kids of both varieties in HS.

[pjmlp]

This is a US thing.

[fioawjpoifajio]

Parent was talking about ACT/SAT, which seem like US things to me.