The reason the -4 is such a monster is that the only flaws to the -1 series is poor climb and poor acceleration. The -4 accelerates in the top 5 and climbs in the top 5. The only down side to the -4 is it doesnt have cannons and its short range in internal fuel.
You're thinking in Grits again, Grits!

It's a monster for you. It's a monster for whoever knows how to fly F4Us.
But think about it - if the average MA folk were people who knew how wonderfully diverse the plane set is, how some planes can be cleverly maneuvered with flaps, how the climb/accel advantage can be used, and etc etc.. they wouldn't be flocking to the Spit16s or La-7s in the first place.
If they understood anything harder than;
* push E for engine, G for gear
* move stick, point direction and fire button
* nose down and run with the fastest planes or start turning with the turniest planes in the set
... then they'd be flying some other interesting planes. Only the real RAF fans who love Spits or real VVS fans who love Lavochkas and Yaks, would remain. And, only when something like that happens, will the arena suddenly be full of people who appreciate how planes like the 4hog, P-47s, 109s, 190s, and etc etc.. work in different ways to set up their fights - and suddenly the "super planes" like 4hogs would become a really dominant threat.
But that's somewhat akin to expecting shrimps to evolve into sentient lobster-men within next 50 years...
Again, if people understood some other reasons than fastest running away speed or easiest turning performance can also make planes 'monsters', then we wouldn't have a dominance/overuse problem with planes in the first place.