Article allows 4/0 al to be fused at 200 amps but it must carry the full load of the structure. I installed a 200 amp panel outdoors with feed through lugs, fed a 200 amp panel indoors. I fed an outdoor receptacle beside the main panel. Inspector forced me to either change main breaker to 150 or run larger wire indoors, all because of a 15 amp receptacle outdoors.
I would better understand not allowing the residential exception at all than having such a foolish caveat. Lighten the load but upsize the wire? I know a good place to shove that.