Sorry you feel that way about it Bunkerbob but this option has been working very well in the 12-volt homes in my neighborhood for over 20 years. Before that people were blowing up lights and TVs.
I never mentioned wire sizes in my post so to assume that I'm "limiting my voltage at the outlets" and causing "tremendous voltage drop" is pretty reactive. Obviously with a 20-amp outlet you're limited to around 250 watts at 12 volts. Above that point maybe you should consider some other sort of connection. The folks around here are plugging in small 12-volt loads, not 1-horse motors. Both wire runs and outlets have to be sized by length and load.
In terms of law vs. what works well I'll always side with what works. The NEC rules are good at preventing fires so I stick to standard ampacity tables for all the wire runs, but I draw the line at unnecessary expense and excessively rigid standards that only function to make everything look the same.
And I work
with my neighbors, not
for them, so they are aware of how and why something is wired a certain way and what the limitations are. Some have used different colored faceplates for AC and DC, or even labeled the covers, but it's really unnecessary, except if they want a reminder of what's what.
In other words, relax