There's absolutely nothing to suggest that BfA is "filler".
WoD was not "filler", it was poorly executed but that doesn't make it filler, the story was still progressed.
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August or September. There will be patches after Antorus, just no more TIER raids.
Meh, I didn't see it as much in Legion as I did in MoP and Cata.. I am sure it was said, I don't know why other than the garrison/dal and a few other little things that seems to be here to stay; however besides what usually comes in and xpack, you toss in uncharted isles and warfronts... It's a tad underwhelming, my guess is that allied races will be in 7.3.5 so they can be leveled prior to release of bfa so players who want to play them aren't stuck in old content while new content is out. Level scaling is on ptr I think, /shrug... So yeah, soo much content...
Disarm now correctly removes the targets’ arms.