I agree, it's not so much that the main story is worth skipping, it's the fact that someone coming in from 4.0 wanting to enjoy the new content, getting burned out because they are burning through content they don't want to do and by the time they get to 4.0 they just grow disdain for the story anyway.

I don't see an issue with allowing players to skip X content but being able to go back to it later, let them fill in the blanks when they get their fill of 4.0 and want to relive the older content. You would get more people enjoying the story if they have the ability to enjoy it at their own pace than to say "nope have to run through all this if you want to get to 4.0" cause guess what,I bet 75% of those people will just escape, skip CS. Yes. and not know the narrative because they just want to get to 4.0.

The game will be better off allowing the person to play what they want and enjoying the older content at a later time at their own pace.