Personally don't think so, I believe content and quality matters. Invariably, different dissertations require different scope and the scope to a large extent predicts the number of tables and pages one will require for a dissertation.
"If I had more time, I would have written a shorter letter", said French mathematician and philosopher Blaise Pascal in his "Lettres Provinciales" (1657). Pascal's bon mot reflects the value and the challenges of brevity: condensing, say, a 10,000-words paper into 5,000 words will help clarify one's thoughts. But, as was said earlier, everything should depend on the research question, bearing in mind contexts and audiences.
PS: To better respond to this query, it would help to know why the administrators of the medical doctor program want to establish a minimum number of pages for dissertation chapters.
I know universities that even define a maximum number of pages for doctoral dissertations. Both approaches are dagerou because both a minimum number and a maximum confound quality and quantity.
It may be harder to judge the quality of a dissertation by criteria that are highly inferent like originality or appropriateness of methods but that cannot be replaced by numbers like a minimum number of pages. That is why it requires experts to review dissertations.
The university may not have a choice. It might be a requirement of the accreditation board or ministry of education (if outside the US). If that is not the case, I agree - the limit should depend on the research question and study results.