As bad as the URLs were, at least you could edit them to get back to the non-AMP version if you were technically literate enough. Now there'll be no distinction, you could get sent to an AMP link from Google which is a lesser experience than the 'real' site and have no way of getting out.
I believe if you refresh the page it triggers a request to the original site, which will probably then choose to give you the non-AMP version of the site.