@jfmengels @ljharb according to caniuse (which is based on Statcounter data), it's 97% of users: https://caniuse.com/es6

Personally, I'm skeptical of the accuracy of Statcounter data, but regardless I still maintain that browser support is something that sites should be deciding for themselves based on their own data—not based on somebody else's data that may or may not be representative of their user base.