I used to think it was just missing too, but apparently, it’s a feature you can enable: https://apple.stackexchange.com/questions/16759/how-can-i-make-safari-show-the-url-when-i-hover-over-a-link

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store