You probably have HTTP access logs and can use that to run your own calculations based on UserAgent and caniuse. We are in enterprise, and 90% of our users are

You probably have HTTP access logs and can use that to run your own calculations based on UserAgent and caniuse. We are in enterprise, and 90% of our users are on evergreen browsers, and the next 9% have a browser version from the last 18 months. For the last minority, we conditionally include a polyfill from polyfill.io “Browser support” is not an issue anymore unless you do something cutting edge, sell to regulated industries like healthcare, or serve many users in China/Africa et al.