How big is the Asahi Team? I wonder, since there is so much of community interest in the final product, why do we not see a lot more community participation in the development as well?

What makes you say there isn't community participation? The repo for m1n1, at least, has 42 contributors according to Github[1]. There's plenty more reporting bugs and such, and their IRC channel seems relatively active.

1: https://github.com/AsahiLinux/m1n1