I think you actually don't know why it's different in Dust versus all other FPS titles: accumulation of skill points in contrast to a lack of a level limit. If you play any other FPS title you eventually reach a "capped" state which, at that point, you can legitimately toss the "it's your skills" insult because if all players have equal access to weapons, fittings, equipment, etc while subject to the same levels, then it really tends to be an issue with skills and overall experience in the game (like where to hide, ambush, snipe from, etc).

With Dust there isn't a cap, someone whose played over a year can have a significant advantage in all areas versus someone who's played in just 4 months. Without this cap it also means that players who've played the longest can maintain this advantage in all situations; even if you swap everyone to use just militia gear they still get boosts from the native armor, shields buffs along with increases in shooting range, ammo capacity and the like.

That's why said "protostomping" is a more prevalent issue because as an attempt at a FPS~MMO, the lack of an upper wall limits the ability of new players to really actually get a hold of the game without dying 20 times. And I can even say when they ambush me in a 3-1 it's not even a guarantee that they can still kill me. While a cap is the easiest way to prevent this stuff, it's not feasible in a game like Dust anymore and we'd need to either do match tiering where there would be or "veteran modes" where skill points are pretty much unchanged but offer significantly higher payouts on the ISK. LIkewise anything CCP does isn't guaranteed to work; players can also enjoy being plain a@@holes and would love easier pub matches just to inflate their bloated egos.