I'm not "pretending" anything. You can't skip the longest part on questlines, which is doing the assaults and the travel time. The scenarios are NOT the longest part, and if you're talking in numbers, the total number of scenarios are
1) First Halls of Origination (skippable)
2) Engine of Nalak'sha (skippable)
3) Second Halls of Origination (not skippable, but the shortest, still an annoyance though that serves no real purpose)
4) Blackwing Descent (Not skippable, on par in length with the first one)
5) Third Halls of Origination (not skippable, on par in length with the Engine).
So, 2 out of 5 can be skipped.
Less than half.