I wonder why Paladins, Clerics, Warlords, Rogues, Rangers, and Warlocks aren't also being thrown into this. You know, all the classes that don't just have cloth armor proficiency. Because if the fighter can't use scale mail if he doesn't meet the prereqs, then no one can. Which really, REALLY makes one question the point of class armor proficiencies.
Note: don't have the books with me, so I don't remember if there's ability score prereqs for the light armor feats or not. But my point still stands - if Fighters can't use scale if they don't have 13 Str 13 Con, then Warlords and Clerics can't use chainmail if they don't also have 13 Str 13 Con, and Paladins can't use plate if they don't have 15 Str 15 Con. Which I doubt many paladins are going to have at 1st level.
So, if you're happy with every defender and leader in your game needing at LEAST 13 in Str AND Con in order to wear the armor they are supposed to to make the game work, that's fine with me. Myself, I'm not gonna run things that way.