Transmission has a bunch of problems with DC as well. Transformers are fundamentally AC devices; if you want to use them in a DC circuit, you need an inverter

Transmission has a bunch of problems with DC as well. Transformers are fundamentally AC devices; if you want to use them in a DC circuit, you need an inverter anyway to convert the DC to AC and back again. There are ways to step up DC voltage, but none are as cheap or reliable at utility scale as a transformer is. If you don't step up the voltage, you'll lose basically all your power to transmission losses, since delivering high power at low voltage requires high current, and power loss increases with the square of the current. High-voltage DC is also extremely dangerous, as it's prone to arcing and electrocution.