Daala's and Thor's features were supposed to be integrated into AV1, but in the end, they wanted to finish AV1 as fast as possible, so very little that wasn't in VP10 made it into AV1. I guess it will be in AV2, though.
I am not sure I would say that is true.
The entire entropy coder, used by every tool, came from Daala (with changes in collaboration with others to reduce hardware complexity), as did some major tools like Chroma from Luma and the Constrained Directional Enhancement Filter (a merger of Daala's deringing and Thor's CLPF). There were also plenty of other improvements from the Daala team, such as structural things like pulling the entropy coder and other inter-frame state from reference frames instead of abstract "slots" like VP9 (important in real-time contexts where you can lose frames and not know what slots they would have updated) or better spatial prediction and coding for segment indices (important for block-level quantizer adjustments for better visual tuning). And that does not even touch on all of the contributions from other AOM members (scalable coding, the entire high-level syntax...).
Were there other things I wish we could have gotten in? Absolutely. But "done" is a feature.
The primary benefit of PVQ is the side-information-free activity masking. That is the sort of thing that cannot be judged via PSNR and requires careful subjective testing with human viewers. Not something you want to be rushing at the last minute. After gauging the rest of AOM's enthusiasm for the work, we decided instead to improve the existing segmentation coding to make it easier for encoders to do visual tuning after standardization. That was a much simpler task with much less risk, and it was adopted relatively easily. I still think it was the right call.
[1] https://datatracker.ietf.org/doc/html/draft-cho-netvc-applyp...