I love flower deck like Aroma and Sunflower etc, their effect and image are quite refreshing, but not again since Sylvan appear, plus flower deck actually get bad reputation because of it, uh seriously dont plunge all flower deck are like sylvan, they are not the same
I don't think it has to do with Sylvans but balance. Some cards become more suspect once other decks make use of them. Sylvans field nuke isn't the issue at all. AT best they can maybe get 1 Marsh with 1500 ATK and a carrot out which means you survive. When you add Rose lover into the fray then you get the 1TKO. Even if you limit Mushroom, and Marsh, you'd still have the potent 1TKO thanks to Ros
It's like in a car race, you are free to use whatever vehicle you choose. Some use high powered bike, some use f1 car, then some dude came up with idea of hoverbike.