JavaScript boy and “lovely thoughtleader” 
he/him 
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Babel never claimed performance improvements over the alternatives. It offered an easy-to-use flexible solution. Yarn focused on performance AND ergonomics, nicer CLI, reproducible installs etc.
I’m referring specifically to build and developer tools. UI and product code is a different ballpark entirely where performance DOES matter and can be a justification on it’s own. More $$$ on the line.
Even then, your original point still stands. If a team of developers is more productive with a perf hit, the scales can be tipped in either direction.
Right, there's a point at which you're spending an awful lot of time and energy trying to get performance out of something that just doesn't yield enough benefit. That said, I generally think we're a ways off that being true.
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