For a while, I considered the fact that I was ESTJ. Hell, it looked good, felt good, sounded good. Besides, I wuv EJCC, so...yeah!
But I think the problem is that when we rely a lot on our Te, we can look something different than what we really are. I think this is particularly true for those of us in academia, where Te is almost demanded together with Si or Ni. For me, it seemed to fit even better because my Fi, frankly, sucks. <--- That is not something to be proud of, btw, it's actually a sign of immaturity and unhealthiness on my part. :-/
Sure, we can don on the ESTJ hat when it's needed, but it takes a great deal of energy, more energy than in our 'natural habitat.' It doesn't mean we are Te/Si losers - it just means we have to 'focus more.' Just like EXTJ can Fi and Se/Ne, but they just have to focus more. Or it's their release valve. Whereas with EXFP, Se or Ne is a natural state we don't even realize. Like, if someone says I have a lot of Ne, I say, "Whoa, really?" But if someone asks me if I can use Te, I'm more *aware* of it because it's in the process of *growing* right now.
Hope that makes sense.