One thing to keep in mind is that patch 2.1 dropped in December of 2013 and 3.0 HW didn't come until June of 2015. You're doing a year and a half's worth of busy work in the time span of a week. With the pacing of the game at the time, this didn't seem to be a bad idea until people who first started playing when Heavensward came out hit that chunk of story. Now 2 expansions in, it's glaringly obvious that the area from 2.1-3.0 was made to keep you busy until new content came out in the form of expansion. The problem is, if you skip all the end game between 2.1 and 3.0 you lose a lot of story that's particularly relevant to the beginning of MSQ in HW.