I am not saying you attacked anyone, but your phrasing was rude in my opinion. No need for the last paragraph, just gratuitous.
I support Web Components (Custom Elements) since 2014 and before, and the @corpuscule/custom-builtin-elements had some FUD in the README regarding my polyfill, but it wasn't intentional, so that everything got sorted by me filing MR to that repository.
I guess there's some history behind you are missing, but the fact people prefer writing from scratch anything already available, instead of helping out, is one of the most obvious reasons Open Source has issues.
So, my comment was about that, and I've clarified with the author of the lib you have pointed me at, so, at least to me, is all good, I hope it's good to you too.
You're free to use whatever library you like, I just know that library has inevitably other issues, but I am not here to describe third party work.
Take care 👋
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