Okay so I'm a bit late to the party, but here's my two coppers.
If the game has mechanics that are not exactly cannon, you can simply avoid using them.
I had no idea this was a thing. Now that I know it exists I will choose not to use it.
But with that being said it is a good idea in that if you are adjacent to a downed character you can use it in the spirit of administering a potion to the injured character.
Hells, the god awful death save in itself is an abomination added to D&D in the 5e rules, so why not have potion sharing from across the room?
