When the features don't work the same way in every browser, it hurts the platform. Poorly designed features are impossible to take back. (see also AppCache). We

When the features don't work the same way in every browser, it hurts the platform. Poorly designed features are impossible to take back. (see also AppCache). Web Components is moving quickly, but there has to be an element of care. Shipping features before they're ready is driven by marketing and PR, not engineering maturity.