Fighters are designed on the following criteria; mission profile and capability. What does it need to do, and what can it do. What targets are you expecting, what do you need to disable or destroy them, and what kind of platform is needed to deliver said weapon to the target.
Fighters can operate as singletons or as a group. There's no design that enhances that feature. Some fighters are optimized for dogfighting, but that doesn't make them more effective alone verse being in a flight group. Dog fighting is like any other confrontation; the more people you have on your side, the higher your chances of victory (platform design and capability depending).
Fighters are usually designed to be inherently unstable to allow quick maneuverability, and fast acceleration. That verse passenger jets which are designed to be highly stable, which is why you can fly big birds into storms, but are advised to keep your hot jets away from same storms.
I've never ever heard of the "sociability" aspect of jet fighter design. That's no where in any of my AIAA publications, nor my books on Jet Fighter design and concept engineering. I can't recall it ever being bandied about as an off handed tactical term.
Getting back to the humorous aspect of a cartoon horse driving a knockoff of a Starcraft Terran AFV, I thought the pic was funny and humorous without really knowing anything about the "MLP Phenomenon". To me, MLP was a series of commercials that aired just as I was weaning myself off of Sat morning and after school cartoons, and it was specifically for a product that my friend's sister really liked. More power to her.
To see some person draw a funny pic and paint it is pretty humorous. Part of the reason I posted it here. But to see that said same artist apparently has an entire series of the stuff ... er, well, hmm ... okay. To each his own.