Do you only play your favorite route to just read the best girl and/or good ending or do you strive for 100% completion? Or do you skip all of that lame story stuff and head directly for the "plot"?
I know, from the return I have with my mods, that there's players who can't live if they haven't seen 100% of the content.
This said, I'm almost sure that they are a minority. Players who want to fap will want to jump from a scene to another as quickly as possible, what isn't compatible with a full completion, that generally need to pass through too much none interesting (from them) content.
As for those who play for the story, I guess that they are more like me, possibly having parallel playthrough, but limiting them to the routes that interest them, and not caring too much about variation that don't interest them or don't really change the story.