This is true about other things like reading speed as well. It still doesn't mean that time limits are useless. These are skills you can develop up to a reasonable level through practice if they're lacking, not something fixed like height. And if it takes you 12 hours to get through a 2 hour test because of these factors it's a sign that you're not going to be a very effective employee/researcher. Being able to read/write with some haste is not unrelated to job/academic performance.
> Being able to read/write with some haste is not unrelated to job/academic performance.
Yes, I agree. But my point is about handwriting, rather than writing in general. Handwriting speed is something that we are effectively testing with many in-class exams. And handwriting speed - unlike reading or writing speed - is indeed unrelated to job performance. It is also unrelated to any reasonable measure of academic performance.