No, you don't need trenches. No, you don't need to repave. Or repaint lines.
Construction is mainly making post holes and placing and truing posts, and pouring concrete. Concrete can be poured at day's end. Electricals can go in last, after framing for the whole lot is up, also a row or two at a time. Wiring does not need to be trenched; it is out of the weather at the ceiling, and more accessible for service.
It is always easy to think of a dumb way to do anything. Admittedly, some people habitually stop there. Some contractors, even.
Construction is mainly making post holes and placing and truing posts, and pouring concrete. Concrete can be poured at day's end. Electricals can go in last, after framing for the whole lot is up, also a row or two at a time. Wiring does not need to be trenched; it is out of the weather at the ceiling, and more accessible for service.
It is always easy to think of a dumb way to do anything. Admittedly, some people habitually stop there. Some contractors, even.