> A new layout mode (like CSS Grid) isn't available yet? This allows someone to write a polyfill for it. That's neat! Hopefully this won't be used as an excuse

> A new layout mode (like CSS Grid) isn't available yet? This allows someone to write a polyfill for it. That's neat! Hopefully this won't be used as an excuse for new standards proposals to never move forward and/or browser teams to slow-roll implementing new standards natively..