If you replay the mission "restoration" you can't skip the cutscene afterwards. If you were farming a boss for a legendary drop this would quickly become annoying.
Also creating a new character class means you have to sit through all the cutscenes again. Don't get me wrong they are cool but when I just want to get to where I can play with my friends they get in the way of the fun.
Strikes me. School boy error to have unskippable movies in a game this century.
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Actually this is rather normal. When redoing a mission you can skip cutscenes, when you die you skip cutscenes, but when you restart "campaign" you can't skip the scenes. I'd love to see it differently, but yea...