Firstly remember the guy in your picture put a lot of effort into pissing that bull off, the people attacked by the panda were just trying to say hello. I'll concede you might have a point when people start fighting pandas armed with bright cloths and a few pointy sticks.
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With Legion the total number of world quests probably rivals MoP's dailies, but by putting the emissary quests in there's a "natural" cut-off so anything beyond feels optional. It's a good way of making sure people neither run out of stuff too easily like we did I WoD, but don't feel forced like we did in MoP.