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I'm not sure it's fair to say VP9 and AV1 were designed purely for those use cases, it's just that that's one of the easiest niches to win if you're a next-gen codec where encoding time is traded for smaller size.
That lets them use it profitably from day one while expanding further into other niches. It probably has impacts on how much effort goes into multithreading or other features that this use case doesn't need.
Libvpx seems to equal x265, subjectively, objectively and in encoding time in the recent MSU study (and both are near the head of the pack) The argument now seems to be that it's the rate control that makes it unsuitable for many users despite good showing in test scenarios. But libvpx having bad rate control is a rather different claim than the VP9 format being 10x slower than it should be and therefore a disaster.
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