To be honest if you didn't enjoy the main story enough to play it until Heavensward, you didn't miss out on anything and Heavensward might not be for you. Heavensward content follows literally the same pattern with dungeons and primals as 2.0 did (as of now, at least)
I wish more people voted with their wallets like this. I do like the story, but I agree 100% that it needs to stop with the useless fetch quests. I think 5 MSQ would be quite sufficient instead of 50+ the we have to do. Of course that would mean those 5 quests would need to be a tad longer, but a LOT more meaningful. We all know when new MSQ content is released, most people clear it in two or three days max. Having less MS quests but more quality would only make everyone's life better.
You did the right thing, OP if there was nothing keeping you there.