Another piece of evidence is Google tries at nearly every turn to help people write portable code, use best practices like feature detection instead of browser

Another piece of evidence is Google tries at nearly every turn to help people write portable code, use best practices like feature detection instead of browser version sniffing, etc... They run https://web.dev/ https://web.dev/ and the founded baseline https://web.dev/baseline https://web.dev/baseline and the web platform dashboard https://web.dev/blog/web-platform-dashboard https://web.dev/blog/web-platform-dashboard MS in their IE days did the exact opposite, trying to make as many proprietary IE only features as possible.