I tried to extend the Fighter's weapon specialization and Combat Dominance (Surge mechanic) to "martial characters", with the effect that no one took the Fighter, ever. A Knight is better, Paladin and Ranger have more "stuff", etc. There is no actual reason to take a Fighter, particularly since B/X and OSE don't really have high ability score minimums (or any). I rolled those back to only be available to Fighters, as in the class, and that's it. I actually had switched to using the Combat Talents from Carcass Crawler #1, which allow Fighters at 1, 5, and 10 to select from 6 Talents, including things like Cleave (Dominance), Weapon Specialization, Defender, Main-Gauche, etc.). Everyone else already gets extra bonuses, so it gives folks a reason to play Fighter.
I am, though, becoming more and more likely to buy the updates, just to have all the extras.