The problem is that the escape hatch from document to application is completely broken. The DOM is fine for documents, but it's completely awful for application

The problem is that the escape hatch from document to application is completely broken. The DOM is fine for documents, but it's completely awful for applications. Admittedly, some things on the web that should be documents insist on being applications instead, but many things on the web aren't documents. For these things, using the DOM is painful. When the pain becomes great enough, the biggest available escape hatch is pure native 2D rendering (canvas), which is a nightmare for accessibility and affordance to end-users. It would be awesome to have something else to escape to.