I understand why SE made this change. It's an awful experience first time when you're watching cutscenes, everyone else runs ahead....and you get lost and actually miss out on combat.
However I disagree with this change as it's going to make players far less inclined to do it as being unable to skip cutscenes will make the instance extremely long. The queue times for it are already long as it is. They will become even longer. This is going to be a disaster.
SE should just change it to a solo duty. That would be the best fix, if they intend to keep all the cutscenes intact.