When you skip cutscenes by the dc/relog trick, you are taking advantage of a game system bug (cuscene not played at relog) and exploiting it during your gameplay.
I personaly don't skip, i don't use this "bug" ( technically it's not a bug that how game work, if you crash it can't resume you in the middle of a cutscene it's impossible ) and i never saw anyone using it yet ... cause it's a pain in the ass to use, i prefer to just play guitar while the cutscene is played.

At least this devil mission make me improve my guitar skill.