iGPU hardware video decoding

I am curious why does qubes not support hardware acceleration for intel iGPU ?

It should work in dom0, but not in qubes (at least currently):

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That is quite odd.
Don’t tell me software emulated GPU can’t be less attack surface than hardware GPU, the fact this is not supported even for iGPUs is truly beyond my comprehension.
Is there not enough developers to work on such features? I am willing to volunteer.