Inevitably though you will have to talk over cutscenes and voice acted lines as many games for example Digimon Story: Time Stranger have a significant amount of voice lines throughout the story which is great but you don't exactly get time to talk. Another example is FFXIV that has long cutscenes.
But as I'm doing that I'm also filling in those in stream that don't know the lore of the series same for when I used to play destiny. I can see what you mean though as sometimes taking that time to just let the voices play out can let your community enjoy the game to it's fullest.
Sometimes i just can't stop myself from talking or making a joke but it's also me showing off my reaction to what is happening for example World of Warcraft has some impactful cutscenes during the story and I can't help but talk as I connect the dots on what is happening at the time.