They mentioned during Blizzcon that the tier sets would be gone in BfA.
A data-mine of the patch 7.3.5 shows some rep requirements for some of the Allied Races, like the Nightborne and Highmountain Tauren requiring exalted reputation."Allied Races locked behind a rep grind is not fun for most people."
1. How is that an argument for it being a filler expansion?
2. What is your source for this?