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Hey thanks for the detailed response. I'm actually all for progressive enhancement, and appreciate the philosophy you're getting at here. I still think, generally speaking, you're either designing for animation or not. With CSS, if something works with a transition it also works without. Once you start meddling with animation states in JS you've taken point on all that otherwise abstracted away state-based logic. What happens when an animation get interrupted, memory use, timing functions, etc. Sure, if you weren't animating a pill-box you might use flex. But if a transform works, why not use that for both animated and inanimate versions? It's certainly not any less correct or legible.