Having done MSQ at least three times, twice pre and once post patch changes, i found the ARR setup well paced and enjoyable. What you dismiss as "filler" has important elements that cant and should not be skipped as unimportant sidequests

The leadup to Heavensward, the missions prior to Stormblood are essential for the integrity of the entire experience, the msq prior to Shadowbringers should not be missed under any circumstances as it is essential for the storyline

Curious: What do you see as "filler'?