I would not use that babel config if I were you, take a look at jamie.build/last-2-versions
That's a very good point although I think using last 2 major versions, not dead vs a % might be a more robust alternative. That will remove older browsers that aren't supported any longer as well as include the latest versions regardless of market share.
last 2 major versions, not dead
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.