Then the problem isn't adding features to make web apps more capable, either.

Web apps replacing unsandboxed applications is a net win. We could argue about whether web apps replacing sandboxed applications is a net win as well, but most local applications on PCs are not sandboxed, and even mobile applications aren't sandboxed as strongly as web apps. (I would love to see an "allow network access" permission on a per-mobile-app basis.)