Google are the ones immediately springing into action. They only started collecting feedback on which sites may break after they already pushed "Intention to remove" and prepared a PR to remove it from Chromium.

> Google are the ones immediately springing into action.

You say that like it's a bad thing. The proposal was already accepted. The most useful way to get feedback about which sites would break is to actually make a build without XSLT support and see what breaks.