How important is the thesis document for judges on the day of the thesis defense?
Is this document important for judges?


You are really asking the wrong question. Any official document that bears your name eternally is important for you and your future. You are a MSc student with probably small number of publications (if any) and a MSc thesis is an important milestone on your transition from a student to a researcher. It is also a quite large document (much larger than the typical scientific publication), so writing an excellent document at this scale is a valuable lesson even if you want to work in industry, where technical reports / documentation and deliverables are quite common. 

Conclusively, you must always strive for excellence and always do the best you can. You must change your student mindset from "Would doing A would get me a better grade" to the adult mindset "Is this really the best I can do within the time constraints I have or could I do better?". So you should focus on producing the best thesis document you can (within your time constraints)  regardless of how lenient the committee might be on judging it.