1. Being accepted as a student is not a walk in the park. Pre-interviews e.g. via email if you were applying to US/Canada determine if you will be admitted.
If a candidate does NOT work on her thesis every day Jan 1 to Dec 31, one will likely be expelled from the course for staying too long or take years to complete.
No employment/child bearing/etc
A/ Proves authenticity & originality of body of work.
Unequivocally discounts plagiarism.
B/Contributes to the body of knowledge.
Papers cannot be peer reviewed & published without huge amounts of research work.