What problem does this address?

Currently in the site editor we are able to preview the current template or page. We are also able to navigate between our templates and pages and preview them individually. However, we cannot 'preview' the site as a whole.

What is your proposed solution?

A new feature to consider would be a 'site preview'. Whether this is a working preview inside the editor that lets the user navigate via navigation links, or another option under 'view' that just opens the front end of the site in an external window, some action to easily preview the site should be considered.