Turrets AP ammo

Does anyone have a theory why turrets (smg, shotgun, etc) can't be loaded with AP ammo?
Probably just to not have them be even more powerful. In the past, it wasn't a big deal because you found a ton of regular ammo and you could use that in the turrets without crafting any. Now, since you can't find regular ammo after the very early game, it is a hassle if you want to use turrets. You have no choice except to spend a lot of time crafting regular ammo for the turrets.
 
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