Should I Include My Entire Work History In My CV?

Interviewer: It says here you graduated in 2011, but you didn't start working until 2015. What were you doing in between? 
Candidate: I was working in XYZ Company as an Analyst. 
Interviewer: Why didn't you include it here? 
Candidate: ...because my CV will then be over 3 pages. There are several points of view on whether to include candidate's entire work experience or otherwise. 
Continue reading for my thoughts. What do you think?