One such example is the ability to copy my own email address. Gmail makes it so damn difficult it's mind-boggling. Whenever I try to copy my email address other elements are included in the selection, right-click is disabled and probably other annoying things happen: https://i.imgur.com/Ds0ROuT.png

Protonmail understood this and catered to this need without much fuss: https://i.imgur.com/1ZhWOsC.png