I Wanna Be The Guy is an indie PC game about NES gaming thats proven to be surprisingly popular. There was an Escapist article about it (Games that Done me Wrong I believe?).
But yeah I think the important wording here is 'no longer'. Code is the file arbiter of a game. Just because a nerf happens, doesn't mean the former tactic was necessarily illegitimate. An example I can think up off the top of my head is the Spy's Dead Ringer in TF2. Once it was released, it was nerfed into a less useful state and then eventually rebuffed to a state near it's original power. Clearly it wasn't 'wrong' originally, but the designers weren't sure about their own item for awhile.
Another thing is that sometimes even legitimate tactics, while 'fine', would improve the game if they were weakened. This is really up to the developers to implement though. These tactics could even be so modest that the most people don't even consider it a problem.
Balance and fun is a tricky, tricky thing.
But yeah I think the important wording here is 'no longer'. Code is the file arbiter of a game. Just because a nerf happens, doesn't mean the former tactic was necessarily illegitimate. An example I can think up off the top of my head is the Spy's Dead Ringer in TF2. Once it was released, it was nerfed into a less useful state and then eventually rebuffed to a state near it's original power. Clearly it wasn't 'wrong' originally, but the designers weren't sure about their own item for awhile.
Another thing is that sometimes even legitimate tactics, while 'fine', would improve the game if they were weakened. This is really up to the developers to implement though. These tactics could even be so modest that the most people don't even consider it a problem.
Balance and fun is a tricky, tricky thing.