I interpreted your parent's comment differently; namely, if Google's developers can't do User-Agent detection, then internally even they will have to improve ho

I interpreted your parent's comment differently; namely, if Google's developers can't do User-Agent detection, then internally even they will have to improve how they develop (eg. via feature detection), making their products more compatible with other browsers. Many people assume Google, as an upper-level business decision, purposely makes products work better on Chrome in order to vendor-lock users to the browser. Maybe that's true; or maybe it's developers being lazy and using User-Agent detection. Removing their ability to do so might actually improve cross-browser compatibility of Google products.