In the '90s devs considered cut-scenes as indeed part of the game, of the whole package. As mentioned it was incredibly hard to even make a cutscene, hence why awfulness like FMV became a thing. It's hard to say if the cut-scenes would of remained in that same category since the chase for 'muh cinematic just like moobies' has completely steamrolled the craft. There will never be such a time again.