Great advice!! Only a few sentences as an intro and to create a central theme and then launch into it!
I think those are both fine approaches but I would try and make sure that those metaphors/themes don’t take away from the body of the essay (Why MBA?/Why Now?/Why School?).
I think those types of themes allow you to create a narrative for the actual content. I put in unrelated but similar type content in my intro to set up who I am (but only a few sentences) and then lightly touched on how my experience and goals related. I also used the personal/interest framework to wrap the essays up.
Here is how I see something like you are talking about working:
“I love whitewater rafting because it’s a combo of brains and strength. My professional experience has been similar. I started as a laborer and worked up to a foreman.
Experience as laborer
Experience as foreman
Typical Why MBA?/Why Now?/Why School
When I graduate from your school and start a construction company, I’ll know that it takes some hard paddling but you also have to know the physics [or whatever, I don’t raft] of the river.”
My point is to use that info to set up your essay but don’t let it take it over/get too cute
"The distribution is fat-tailed relative to the normal distribution"
~ Eugene Fama Professor of Finance, University of Chicago Booth School of Business