I'm in agreement, the UK doesn't use these.

They seem more suited to engineering where the equations you get might exceed the mathematical ability of students to solve them, or the maths is irrelevant to the engineering problem and you just want an answer within a few decimal places.

If I were a teacher I would worry that eg students ask the calculator to solve, get 7/2 and use that as a reminder of the technique to symbolically solve the problem.