Did not the conventional armor in Ice Wind Dale 2 have Agility maximums that limited your natural agility bonuses while wearing it?
IWD2 was a 3E D&D game. I didn't design that mechanic.
This is true... This is also basically how it was in Fallout 1 & 2 though... and I don't really see the reason against it.
Because it removes decision-making from high end armor. "Would you like to wear power armor or some other armor that is worse in every practical way?" is basically the question asked in F1/F2.
If a person were alive in a post apocalyptic wasteland, and had the choice between leather armor, metal plating, high-end combat armor ~and a powered exo-suit with filtered air....
Which one would most choose to wear most [if not all] of the time?
Again, that's not the point. If I, as a designer, have the ability to balance high end armor so a player has pros and cons for wearing one suit or another, why would I not do so?