I'm an ENFP and I can confirm that we're all shallow idiots.
Jack of all trades is definitely a term that applies. But while we lack the patience to pour over a textbook cover to cover, we fall into the wikipedia blackhole on the regular (or at least, that is my experience). Why have depth when you can have breadth? It makes it easier to grasp ideas on the spot because you've got multiple reference points, not to mention we're pretty damn good at bullshitting our way through things convincingly. Most of the time, it isn't even bullshit; we surprise ourselves by what we know and what we think about a subject, because we're 'think as we talk' people. You're not going to see us sitting on the toilet of life, pondering things. We're too busy playing CandyCrush and catching smatterings of your philosophical discussions which will probably come to us in the middle of another discussion later and we'll randomly connect it with the Jack the Ripper case when it comes up obliquely in the next couple of days.