PLEASE PLEASE an Undo

[luisphysics]

It would be interesting to find out why this feature wasn't introduced in the initial planning of the prime software. Maybe there was a trade between and undo and some other feature that we don't know about. Or it might not have been important enough.

Under the premise that the HP Prime was designed for education. Kids tend to make mistakes. So it would make sense to "me" to make the software at least a little forgiving of mistakes.
Maybe the math educators testing the software didn't want an undo mechanism. But in America you are expected to use a pencil, because the teacher tell you that it is easier to fix a mistake, and it allows you to make your homework pretty so that they can grade it.

If this feature doesn't come I will live, but it doesn't mean I will be happy.