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The positives outweigh the 37 extra keystrokes you have to make to do the exact same thing as before.

What was the downside to doing the same thing as before by default?

Backwards compatibility? Keeping with users expectations? Sensible defaults? Where's the fun in that?

There's a pretty lengthy discussion about it here https://github.com/babel/babel/issues/2168

I may do a followup blog post about it.