You are right [0]! I haven't really used any of these in the past years. Whoever came up with that should be banned from language design for life! Every language becomes Java given sufficient time - just like every data format becomes XML.
You seem to have a general problem with the object oriented approach. As JavaScript is a general purpose + general audience language it tries to have minimal support for common paradigms (both fp and oo). That's fine IMO. Private props are fine. They are easy enough to learn and do not really get in your way in JS.
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[ 4.2 ms ] story [ 14.4 ms ] thread[0] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
[0]: https://en.wikipedia.org/wiki/Number_sign
Recently was working on Deno project and not having to worry about esm vs commonjs was so so nice.
[0]: https://github.com/neuenet/blog