Is day-of-coordinator responsible for keeping people on schedule?

Our day of coordinator did everything that seems typical-made us a detailed chronological itinerary, coordinated loadin times with vendors, etc.


However, my wedding party ran late to the venue because of photos despite HAMU being done on time, and the coordinator never stepped in and said anything or gave time warnings. We had 10 people over there and although they are reasonable and didn’t cause problems, 10 people need direction.
At the venue, photography continued to go over time and DOC continued not to say anything or intervene.
We ended up getting an hour behind. We were going to get 20 minutes dancing with our guests and we were able to extend by an hour, but at an expense over $2,000.
Later we reached out to the company about the situation. They told us the timeline was tight to begin with (we were never told this, and if that’s the case, wouldn’t it seem the DOC’s job to give more time warnings?). They also told us they received the photo list from our photographer on the day of the wedding after asking for it 3 times and didn’t have enough time to process it (yet they never reached out to me for this; I had it and could have sent it to them).
Are these things the DOC should have been expected to do or are these more the fault of photographer or other vendors?