Several BIG reasons for AC power.

Transformers. They ONLY work for AC power. Very hard (therefore expensive) to raise or lower DC voltage. So if you have a, say 100,000 volt DC transmission line, how do you get it down to a usable household voltage.

Motors. AC motors have no brushes to wear out. AC is much more convenient for making things turn, like say a refrigerator’s compressor, or the air conditioner’s compressor.

Lighting. While conventional light bulbs will work fine on DC, fluorescent bulbs use ballasts to make the voltage they need to run. Guess you could use LED based lights, but those are not yet commercial.

And the Biggest reason… Trillions of dollars in both utility infrastructure and industrial, commercial and residential equipment designed for good old 60 hz.

Rematog