I am wondering about this too. In my experience (Eastern France), right now Apple Maps excels in two things: the looks and a smarter routing, avoiding smaller roads, especially compared to Waze. The rest is hit & miss. Just today Apple Maps failed to know about the exit closure on a big roundabout, so needed to switch back to Waze, again.
It would be great if they could implement some sort of a live user feedback on the road conditions and, while at it, maybe also update their core maps with the same frequency as Google & Waze. Let’s see what Monday brings!
Closed roads are the responsibility of the local jurisdiction. They have to report the closures (usually in advance) to the data provider used by the mapping programs. If those don't get submitted they won't close the road. Perhaps Apple should do a better job of letting local governments know who supplies their data so that when updates are made to the google map providers they can submit them to Apple's provider(s) as well.
Not so sure about user input on closing roads (officially) in mapping programs. Get enough knuckle-headed kids together and they could close off a road.