Hi,
Yes, transforming DC is not easy.
However, DC works good at long haul transmission because a lot of energy is lost in the revers EMF generated by AC a several hundred volts. Some years ago a high voltage DC line was constructed between Oregon and California to deliver power to California. The line converts to DC at one and and back to AC at the other.
Then again POTS phones have always used DC.
DC is commonly used in telecom equipment.
Well into the time of AC Portland, Oregon provided DC to the theater district for use in carbon arc lamps.
It might be noted that the 120v RMS at our wall outlets actuality has a peek value of 169.7 Volts from zero. Or 339.5 volts peek to peek.
Gary