It's always been that way, that's pretty much a standard for every video player both web and heavy clients
this post was submitted on 02 Jan 2024
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This is a pretty dumb question - I would always expect a double-click to fullscreen, and a single click to pause/play on any video in any video player.
The decision was probably made many years ago for the very simple reason that clicking specific targets is much more difficult, so enabling people to use scroll wheel and mouse buttons to do things is a very efficient method of control.
It is pretty common, most video players on Windows for instance - this is the default shortcut.