Since I discovered what 3-phase electrical power is on Wikipedia, I have noticed that it's associated with very high-power applications. I have not been able to find anything on the subject of 3-phase power for anything but very high-power applications, and it appears that the only 3-phase power outlets in existence are meant for ultra-high-power industrial equipment. I find this strange because I imagine (lower voltage) 3-phase would be better than single-phase for household power outlets.
The main reason that I think 3-phase would be better, is that it could be rectified into cleaner DC power. 3-phase consistently provides power while single-phase repeatedly goes down to 0 volts before rising back up. 3-phase would naturally make less power-supply noise, so we could have cleaner power with smaller capacitors.
I make guitar pedals as a hobby, and power supply noise is quite a nuisance.
It might possibly be safer, as the AC voltage could be lower (in case if two wires are shorted together by a person), but it could still have a higher DC output power with a 3-phase rectifier, and possibly other things.
So why is it that home power outlets aren't 3-phase anywhere in the world, or even interest in it?