I much dislike that the #Steam client (and perhaps other game managers) can't discern if the game has left the main menu or is on pause for the purposes of counting game time.
Due to the #NextFest technical wonkyness the demo listings didn't show if you already installed a game or not. You had an “Instal Demo” button and if you had a game installed it launched it.
Now I have a demo played for 38hrs, because it didn't spawn a game window.
Edit: see next toot.