Where the driving license test goes badly wrong, and not just in Thailand, but in the UK and probably other countries also, is the eyesight test.
Test examiners etc, are not qualified to give any kind of eyesight tests. That should be left to qualified opticians.
Thailand is the worst with the stupid test involving lining up the two sticks. I stood and watched people taking that test a few years ago, and they were failing one after the other, no one is going to tell me that all these "failures" have defective eyesight.