When I watch anime, I watch the OP and ED once on the first episode and then skip everything extraneous after that, so I'm viewing one continuous "movie." So, chapter markers are extremely important to me. If my guests want to see the OP more than once, I can do that as well, and still skip everything else using proper chapter markers. I don't have the time or desire to watch a bunch of "commercials" - OP, ED, credits, previews, reviews, and especially disc-opening trailers. We are inundated with commercials on television, so much so I cut the cord on all TV reception years ago - I buy Blu-rays specifically to get away from all that. I also have no desire to watch any on-disc extras, so I totally avoid them.