I've ran old fc members with the specific intent to let them watch the cutscenes, we just tell people up front, mostly everyone is ok with it, others that don't like it can either deal or leave. These days tho I don't grasp why people want to run their first time via the DF, instead just run a PF with the intention of watching the cutscenes. 50s MSQ dungeons like Prae can be done unsync'd without troubling anyone. I've had people help me with relic dungeons in the past even tho they weren't doing relic in the PF, so it's entirely possible. It's a win-win situation..