Yes, but the very most efficient AC motors and compressors motors use variable frequency drives, and you can design a VFD powered by either AC or DC. I still d

Yes, but the very most efficient AC motors and compressors motors use variable frequency drives, and you can design a VFD powered by either AC or DC. I still do think AC is still advantageous in a lot of ways for power grids though, just not on that particular point.