Wasn't there some kind of components proposal that would let modules written in different languages running in web assembly interop with each other?

WASI is great but there was an opportunity to standardize on something much more powerful.

Anyway I think the logical extreme of Unix philosophy started with Unix, moved on to Plan 9, and continued to improve from there. It's just that those further advancements are less popular and well known.

An old-fashioned file is not the logical extreme of anything. Not that it isn't useful or interesting.

I stead we don't even have a good way to do any kind of networking.