Two points about the GPU comparison. Modern GPUs, including the 7900 XTX, have tensor cores which give higher TOPS, especially for smaller data formats like int8. Desktop GPUs are also driven to power levels and voltages are beyond peak efficiency, so TOPS/watt will be worse than an NPU by design. (I'm sure the overall architecture is also a factor, but don't underestimate the effect of those comparatively simple power/frequency/voltage decisions.)
And of course, software support is still very much in "I'll believe it when I see it" territory.
And of course, software support is still very much in "I'll believe it when I see it" territory.