Because the stats don't really matter in this game; they just get bigger. If the numbers were significantly smaller and we had actual control over distribution, then it'd be another story, but unfortunately that isn't the case, and it's far too late in the development cycle to change it.

Tbh, they could probably do away with everything but the core five attributes and focus on providing customization elsewhere where it actually matters (i.e. skill loadout/alternate specs) instead.