We discussed about a long known story https://review.openstack.org/#/c/552924/

The whole agreement during the PTG was to keep things simple with baby steps :
- only supporting a few NUMA queries and defer others as unsupported (still supported by legacy NUMATopologyFilter)
- The to-be-resurrected spec would be only focus on VCPU/PCPU/MEMORY_MB resource classes and not handle PCI or GPU devices (ie. level-1 tree, no children under the NUMA RPs)

Agreement was also there for saying that functional tests should be enough since PlacementFixture already works perfectly.

-S