Is it good to summarize your study cases in a thesis?
The very point of a survey work / literature review chapter / background section/related work section is to summarize the existing work that in other articles.

These sections are compulsory in my sub-field (NLP/ML). With all papers having a related work section, and all thesises having a literature review chapter.
More generally It is my understanding that even in fields that don't include a related work section in papers; they do include a literature review in thesises 

The notion of one page max per summary, is I feel a bit constraining though.
For example in a book I recently wrote that summaries the state of my subfield, sometimes it took me 2-3 pages to summarize a particular complex or particularly important algorithm.
Conversely, other times I was able to summarize 5 algorithms in just 2 pages;
and I could highlight that infact they were all variants on the same overall principle (and highlighting these common features in works that are not obviously from the same source is a good thing to be doing.)