Thanks for the link, I just watched too. I still think it's worth following.
If back then everybody thought 'A let's see how the others do the walking', we'd still live in the trees.
But they did adapt, they didn't keep their own tree ways on the ground, we walk upright now.
Things that might be fine for the trees (native apps in relatively unconstrained OSes) might not be for good for the plains (managed bytecodes in a tightly constrained VMs).
I think the people that really believe in webassembly start over and make it right, they don't try a quick fix by trying to retarget something potentially unsuitable.