Was going to reply something something about sandboxing but then I realized: If we're going to sandbox native apps, I'd rather it be done by a cross-platform standard like wasm instead of done differently by each vendor.

The fact is, this web assembly stuff could be seen in some ways as a response to the walled gardens being built by each vendor right now. I prefer native apps too, but if we're going to have walled gardens, why not one big one we can share.