Plan review can include calculations of the lighting load - including assumptions for any receptacles on the lighting circuits. Too many loads, and you don't get your gold star.
OK, sure, you can wrangle with the city over this, but that can be tough when you're bound to the DOE program. Net effect: lighting is segregated.
Another complication creeps in when the lighting circuit has some manner of automatic control. Interrupt the power to the range igniter for even a moment, and the homeowner is likely to have to crawl behind the range and reset the gas valve.
Murphy's law- or paving the road to Hell with good intentions.
