The Man Keeping the Martial Down

[Kyutaru]

So you could have "gritty fighter with almost realistic abilities" and "near balance between magic users and fighters" and "Magic users with almost world shaping abilities.

Since E6 was mentioned, Ryan Dancy splits tiers like so:

Levels 1-5: Gritty fantasy
Levels 6-10: Heroic fantasy
Levels 11-15: Wuxia
Levels 16-20: Superheroes

In the same sense, not all superheroes are born equal. The mages definitely reach near to the power of Doctor Strange while martials are left little better than Wolverine. If you wanted to upgrade a martial to something like Captain America then the current feat system is just not going to cut it. High level warriors don't gain tremendous stacking power from a few late game feats mostly because there's no tier structure for them like there is for spells. Meeting the requirements tends to be very simple for the majority of them and only a handful are gated for later levels of power.