You could still convince users to do a double click, no?

Honestly a decent sized chunk of users that I support double click most things anyway.

A large chunk of the user base doesn't know the functional difference between icons, hyperlinks and buttons.

Given that a large chunk of the web creator base seem to use these interchangeably nowadays, the confusion is unsurprising.

Unfortunately that is true, and it's really bad for accessibility too (using links as buttons, but not coding the keyboard events that are used on buttons, for example.

Well, yes; you double-click the play button to play the video/iframe. I'd be more worried about "Oh, the button did nothing, I should try again.". The real fix is to not allow transparency/compositing.

My dad double clicks everything. So yeah its super easy