I mean yea it's very power efficient but if it's missing VRAM then that's a problem Apple should solve.Because the GPU is starved for memory bandwidth due to the unified memory architecture.
If the GPU had its own dedicated VRAM, this would be a very different story, but for what it is it is second to none in its TDP-class.
We know Apple has the superior TDP and power consumption. Forget Intel as they're still determining which way is up. AMD would have a superior APU if they stopped using 5 year old GPU Vega architecture but as you said they don't have a reason to release it.That's becoming a bit apples to oranges in such a comparison.
Certainly any modern GPU with a 150 watt TDP or greater will crush the GPU and hardware in the M1 SoC... an SoC that has a TDP of less than 35 watts.
This is why we are trying to compare the M1 to other CPUs/APUs/SoCs within a similar TDP range.
This video showcases exactly how the M1 flat out destroys similar offerings from Intel and AMD, and is very fair about what is being compared and the results: