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saltana : Well, my dear, since you've got so few replies thus far, I'll give you a dozen replies' worth. I hope you wore pretty undies, because you're in for a reaming.
Energy, time, and resources.
As you say, Fives are known to be conservative, almost reclusive. ENTPs are known to be gregarious. I must have found a good balance, because I rarely sense any conflict. Being a whole person beyond the conflict of definitions such as "5w6" or "ENTP", that shouldn't be surprising. Typology is an illusion, after all. That quasi-nugget being said, belonging to those two groups still has telltale signs.
First off, I usually finish my "social sorties" before I even notice that I'm tired. Not until I'm walking away do I notice I'm knackered. Second, it does happen that I run out of fuel while I'm with people, and that sure is a sea-change. It's like someone decimates my Speech Skill and my conversation options get halved. Imagine a Bioware game HUD where suddenly the only choices are "I see." and "I have to go." From what I surmise, people will think I'm in a
mood, but fact is that I'm of the same mood, I've just lost the motivation to carry the larger share of the conversation. I know, consciously, that I'd usually have something to say, I just don't know anymore what that would be. "Why are you so silent? Are you okay?" "Yeah. But I should go."
How does it
specifically and
practically affect my playfulness? I don't know, I'd like to think I'm pretty playful. I doubt there's really any friction between these traits. It's like saying, "You love good food, but you also prefer smaller portions, how do you do that?"
Cognitive extraversion, or is it social?
How cognitively extraverted am I? Hella. Social extravert, too, without company I kind of languish. But here's the kicker, the big secret. All the behaviour and motivation implicit in what Jungians call Extraverted Feeling, corresponds to the kind of social behaviour we assimilate through classical conditioning. That is to say, the behaviour we observe(consistently & over time) will increase social standing, undermine rivals, and strengthen bonds with our in-group - we absorb and put into this mental construct that we continuously gauge ourselves and others against. SFJs are the extremes here.
My point is, once you really understand that, it's relatively easy to shed the counter-productive(yet automatic) social behaviour and social needs, and replace with something a bit more sustainable. Facebook/instagram likes, Tumblr shares, quantity/quality sexual partners, laughs for our jokes, and right down to gossip, criticism, and judgment. Some more healthy, some less. My
need for socialising is often a need for validation and assurance. I've simply become economical about what signs I take seriously. I don't even have Facebook.
As a Fe-user, you need more validation from your in-group than others. With a little work, you can be smart about it, though. I'm needy as hell, we all are. How we get our fix is actually up to us, though.
Hehehe... God damn, it seriously just dawned on me. How do you recognise a Five ENTP? It's the one dismantling her own social behaviour and assembling a more efficient substitution. That's actually fairly epiphanic.
Jacks-of-all-trades
From my experience with ENTPs, we are drawn to specific knowledge with general applicability. Theoretical concepts are useful if they are recognisable in many explicit forms in the world we live in. Engineering is fun, because we recognise the physics and principles of construction in everything around us, from martial arts to baking cakes. Leonardo da Vinci saw mathematics in all he could observe, and similarly the great Niccolo Machiavelli felt the currents of power move the same way in every court he visited.
Find me a politician who's deeper into realpolitik than Machiavelli or a physicist that dwarfs Feynman. They were true specialists, and their secret was to find something you have a knack for, and develop the keen powers of observation needed to recognise that something in everything around you. No field of study can get boring if you are able to discover new sides to it all the time.