As for Work Graphs, we are not using them because we have implemented our own subset internally. After consultation with IHVs, it was unclear if the native support would be significantly faster than our current implementation. Additionally, we would still need our current implementation for older hardware anyway (e.g., GTX 970 or RX 580). However, we’ve given the IHVs access to our code so they can experiment with it for future architectures.
In terms of the most impactful, it’s hard to say. Unfortunately, Tiled Resource Tier 4 is difficult to use properly on a PC architecture, so we don’t think that it will have a huge impact. Work Graphs definitely have the potential to be most impactful, but will likely need a generation or two of hardware advancements to really see the benefit.