You may be right.
AC once held a huge advantage over DC in the past.
But as the cost of DC-DC converters has dropped, the relative advantage of AC has dropped and in some cases crossed over.
If we were designing a new power transmission system today, DC everywhere might reduce total system costs.
For an equivalent power and current levels and reliability, DC requires slightly stronger parts for circuit breakers and fuses and lightning arrestors; but AC requires slightly more expensive transmission lines and better coordination of power generators to avoid cascading failure.
Even though (for historical reasons) AC equipment has mass-production economy-of-scale advantages over DC equipment, the designers of many recent long-distance power transmission systems have apparently decided that using high-voltage DC (typically 200,000 VDC) has lower net system costs than using AC.
Even though (for historical reasons) many airplanes and the Space Shuttle use 400 Hz 120 VAC, early plans for the international space station called for it to use a 20,000 Hz 440 VAC distribution power (!), until program priorities changed and the engineers switched to 120 VDC power.
(Mukund R. Patel p. 543)
People at Google (a,b) have suggested to desktop and server manufacturers that net cost could go down if we switch to "12V-only supplies" that convert the AC mains power to 12 VDC, and then the computer motherboard requires only 12 VDC, which it steps down to whatever collection of voltages it needs (like most laptops), rather than the current ATX power supply configuration that has a thick bundle of wires with a motley assortment of voltages.
Lee Felsenstein and Douglas Adams have gone even further and asked that someone develop a standard 12 VDC distribution system.