It is an interesting point about handwriting as distinct from reading or writing alone. I appreciate it, thank you.

I would not concede that speed is not as important as doing it correctly in the context of evaluating learning. There are homework, projects, and papers where there is a lot of time available to probe whether they can think it through and do it correctly with no time limit. It's ideal if everyone can finish an exam, but there needs to be some kind of pressure for people to learn to quickly identify a kind of problem, identify the correct solution approach, and actually carry out the solution.

But they shouldn't be getting penalized for not doing a page of handwritten linear algebra correctly, I totally agree that you need to make sure you're testing what you think you're testing.