Think as you want. You can’t change the definition of the word because of how you feel. Now sure if a large enough group did to a point it invalidates the old definition sure you could but in this context a Dev making a fps won’t be saying “Oh shotguns aren’t hitscan because someone said it on a OW forum.”
This is more of the case that you could call a playstyle hitscan and some hitscan heroes don’t fit into that playstyle but that doesn’t mean they aren’t hitscan. It would be akin to saying a Panzer tank isn’t a tank because it’s not a hero in OW. This is how language works.
Now definitions of word do and can change but this isn’t how that happens lol.