What they said.
It's pretty much a common sense thing at the end of the day though. Sure you can descend down to 300' above obstacles by day assuming all other criteria is met, but sometimes you just won't feel comfortable doing so if you're local knowledge is lacking.
It's the same with the old "but how do you know if you have 4.2k vis when you break visual"? Well you don't exactly. Its common sense. If you can see enough of the runway to make a safe landing then that is what most people are looking for.
It's where the importance of experience and making command decisions comes into the equation.