I have both with the red dot co-witnessed to the iron sights, and zeroed at 100 yards.
Second the motion. It isn't difficult. Also, spare batteries. I also have more than one spare magazine... ;-)
Ditto for the AR. I imagine most of us would be working at 150 yards or less 99%+ of the time.
As for the AK, I'm not putting $$$ into optics for a rifle that is not designed for sniper distances. For an AK at 100 yards you better be just as good with iron as with optics or you're not practicing.
My suggestion to someone that is fixed on optics, take a couple of Appleseeds. It will teach you / show you that for a civilian in real world SHTF, iron is a lot more effective than you think.