Weddings are tricky, because the HC is paying for a professional photographer, often by the hour, and a lot of times, the rest of the invited guests are waiting at the reception (usually cocktail hour) and if every.single.family member gets a picture with the HC, it could take a very long time, and potentially throw the timeline of the reception off. I know that when I married my now-ex, my now-ex MIL insisted that some of her side relatives who were quite distant get photos with myself and my now-ex, but didn't express this in advance. Meanwhile, all of my side (except my parents, sister, and grandparents one one side) had left for the reception. So, not only were we running late for the reception because the photographer took his sweet time to get all these shots that neither of us had really wanted, when we got the photos later, we had a slew of them for his side and few of them for mine. (Whole album is in the trash now, so it's all good.)
But I agree with the OP--I would let the HC dictate the photos and would try to stay out of the way otherwise. Note, then, that when I married DH, we discussed with each other and the photographer who we wanted the "staged/posed" photos with at our church, made sure those people knew to stick around before heading to the reception, and instructed the photographer to try to canvas the room in the time we had remaining to get photos of the rest of the guests. It worked out quite well. We ended up with photos of the people we absolutely had to have with us, candids of the rest of the guests, and others at the reception (not professionals but some with quite good cameras) took plenty of others. I don't have a single shot that I *wish* I had but didn't get. (Well, except for the one of us coming out of the church--it was blurry. But that's because our photographer wasn't as awesome as we'd have liked.)