frankly speaking, till today I didn't even notice 0213.
I have almost 11 yrs of work ex and I can claim in any of the 2174, 2173 and 2171. (and now even 0213 after reading the description of that NOC).
I took a decision to apply to canada just a couple of months back and then I stumbled upon this forum where every Indian IT guy is talking about only 2171, 2173 or 2174. So I concluded it is a safe bet to apply for 2171.
But, just today when I was seeing financial managers and marketing managers profiles, it struck how come there is no IT manager NOC. And then I read about 0213. But as you said, there must be some reason that NOBODY applied in it till now.