If the AMP page doesn't have the content you want and the non-AMP page does, that is the publisher's problem and the search engine's problem for displaying an inferior page. It is not a problem with AMP, which usually has the information I need. Similarly, if a mobile-optimized page does not have the same content as a desktop page, that is also a problem with the publisher and the search engine. The same for if an RSS entry does not have the full content of an article or if a transit feed does not match the data that is on a transit provider's web page.

> the real one, not the AMP one

Is that the mobile URL or the desktop URL? This problem has existed for ages. It's the user agent's problem to give a UI to share the canonical URL if that's what the user wants.