why doctors handwriting so bad?

we have all noticed that doctor's handwriting is so bad but according to the doctors secerts, thear bad writing is a matter survival

1. doctors have done a lot of studies before becoming a doctor they have passed many exams in very short time.
2. they write a lot in less time to save time. that's why their handwriting becomes so bad that people can't understand.
3. doctors have to look for more patients in a short time, for this reason, writing their prescriptions quickly their writing gets worse

the common word we have always heard is that while taking notes in college and medical school, a doctor,s penmanship deteriorated over time. by the time getting practice, those writing habits could not be "unlearned".
because they have completed bigger and bigger examinations in less time. and due to this in the time saving cycle they always wrote very fast and for this reason, their handwriting is so bad that people are not able to understand it anymore