Never read that myself. But so what? Does that even matter?
If they hadn't given Fighters a good BAB, other classes would be better at melee than they are. (Shut up Dandu, etc., we all know about what spellcasters can do in combat...
) If they'd given Fighters the ability to cast spells in armor, they'd be poaching on wizards...
All that "niche protection" means is that if they'd designed the game differently, it would be different.
True. But all class/archetype RPG systems will bundle things, just not necessarily the same things. Look at any of them.
In a very real sense, class & archetype RPG systems use class & archetypes as at least a partial if not wholesale mechanical stand-in for "background." By choosing one, you are necessarily saying something about the life your PC led before becoming an adventurer.
The strength of this design is that it speeds up the creation process. The weakness is that it neccessarily means that there will be incongruities- some quite major- between the mechanics of the character on the sheet and the concept in your head.
Personally, I prefer HERO for reasons along those lines. Gotta love infinite customization. It means that the gap between concept and character is smaller.