It's all about bandwidth and latency. Roads don't need to worry about it, they're piles of asphalt flattened to the dirt, the bandwidth and latency come from how much stuff you can put in your car and how fast you can drive over it. Same goes for mail and parcels.
Electricity doesn't care about latency by the nature of how it works. It doesn't have to go from generating point all the way to consumer due to the nature of alternating current, so it arrives at precisely 60 Hz every single time.
POTS doesn't really need much bandwidth to run, it only needs about 3 KHz to function perfectly.
Now you want to send broadband data service out to the sticks, which requires exponentially higer bandwidths to transmit data correctly. This is where the real challenge lies, since you just simply can't send that thick of a data transit medium that far without incurring phenomenial expenses to keep the signal in good condition. To put it into perspective, the 3 KHz of POTS bandwidth frequencies that are truly reliable over long distances is good enough to modulate and send ~6 kilobytes of data per second, hence the common modem transit speed 56Kbps. (The additional 20 KHz used for DSL service distorts and fades and becomes unreliable after relatively short distances, if anyone who has ever lived far from the DSL office knows all too well)