I think this could be a good solution for old browsers. For public sites which don’t require login, it would be pretty easy to re-use the crawler view to provide a backwards-compatible read-only view.
It gets more complicated once you consider login_required sites, or sites with secure categories. If we want those to be accessible to older browsers, then we will need to re-implement the login and password reset flows in a compatible way.
Still achievable, but will require some development