From the perspective of a package maintainer (I don't deal with the core infrastructure of our packaging system, I just package and patch things):

While this unusual bootstrap with a WASM stage and a C WASI interpreter doesn't satisfy "everything from source" it's so much better than sitting on a non-Intel/ARM or non-Windows/Mac/Linux machine and having no other option but to maintain 5 different ancient versions of a compiler for a bootstrap sequence, or worse, being required to cross-compile from another host.

Thanks :)