Why are ES6 class methods not automatically bound to the instance?

[Sam Gluck]

Hi all,

Hope this is the right place for a purely out-of-interest query - if not,
apologies, please ignore!

Why are methods on an ES6 class not automatically bound to their instance?
Is there any public documentation/conversation, or reasoning, that can
explain this decision? (I couldn't find any on esdiscuss.org.)

Thank you.

Best
Sam
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