I guess I'm just trying to figure out why this should be the case, and why a straight-up longsword, rapier, or greatsword wielder couldn't just take this class. After all, EWP gives you a very specific benefit for the proficiency: A higher damage die, a higher threat range, a higher multiplier, or a special ability (tripping, flexible reach, etc.). It's not a bad spend for a fighter-type, and on top of it, a number of very good character options (dwarf, samurai, etc.) get it for free. So I don't see why a martial weapon wielder would be more powerful with three levels of EWM than would an exotic weapon wielder. If you've got some insights, though, I'd appreciate 'em!