Safari will auto-expand the AMP link to the deep link, so at least within iOS's default browser and using its share sheet, AMP doesn't break link sharing.
Besides AMP pages break horizontal scrolling in some page as well. For example: https://www.google.ca/amp/s/ca.finance.yahoo.com/amphtml/new... You can scroll left and right but it is not supposed to.
Some app will also render wrong thumbnail for AMP links as well.
Altogether AMP makes the UX much worse :-/