That doesn't make sense; every game has a depth buffer, but not every game has motion vectors.
Oh, d'oh, no you are right, DLSS 2 on does pass the depth buffer to the model https://developer.download.nvidia.com/video/gputechconf/gtc/... (but the neural rendering does not seem to rely on it?)
Because the depth buffer isn't always accurate or accessible.
WoW goes to lengths to hide its depth buffer.
Oh, d'oh, no you are right, DLSS 2 on does pass the depth buffer to the model https://developer.download.nvidia.com/video/gputechconf/gtc/... (but the neural rendering does not seem to rely on it?)