Unlike NaCl, Wasm doesn't require building an entire separate (undocumented and unspecified) API to make it work.
Accepting NaCl without accepting PPAPI would not have been very useful. Accepting PPAPI was a non-starter without a lot more work than Google was willing to put into it.
Accepting NaCl without accepting PPAPI would not have been very useful. Accepting PPAPI was a non-starter without a lot more work than Google was willing to put into it.