I have extra time (plus laptop) for all exams, mainly because my handwriting is dire. For some reason I get extra time for maths also, when I really don't need it: I tend to walk out at standard time for these, feels unfair otherwise. Extra time in maths is extra thinking time, not extra writing time. But certainly for the sciences, Physics and Chemistry, having extra time to type up wordy questions is a relief.
While the tests they did (for time and handwriting) I genuinely got flagged up on, it has to be not too difficult to cheat on those. Still, there's a difference between writing deliberately badly and writing badly because of natural lack of speed/legibility.