Because they would *prefer* a Switch version. And I imagine the resale price and demand on PS4 copies just tanks when a Switch version is announced, so they can't flip it easily when it happens. Now these salty people are skipping interesting games.To the bolded, why would people be unhappy with a Switch version being announced? They bought the product, they were interested in the game, and they got it. And if they are angry? Who cares! A new version is out for other people to buy. Who cares if people are salty that more copies of a game are available.
Please don't use a stupid "who cares about _____!" dismissive argument. That can be said about *everything*.