What about packaging & distribution? Unless I missed something, it's up to us to package & ship our app complete with assets.
I firmly believe that this project is incomplete without a standard like .war (Web ARchive, from the Java ecosystem).
Of course, you could just use what's out there eg. .app (macos) or .appimage (gnu/linux) but there has to be a well-defined and clearly endorsed way of distributing wasmer'd apps.