It's sort of clear they intend to do a rewrite of Google Docs in C++ or some other systems language and compile it to webasm because of better tooling. That's

It's sort of clear they intend to do a rewrite of Google Docs in C++ or some other systems language and compile it to webasm because of better tooling. That's why they went went canvas instead of webgl, since webasm+gl was never widely adopted or complete.