he/him 
YouTube's UI is still built with Polymer 1. They did test with Polymer 2 but they're kinda... stuck at v1 to this day
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Custom Elements and Shadow DOM both changed from what we now call v0 to v1. This is when Apple, Mozilla, add Microsoft agreed to implement.
That just seems like a risk for implementing a spec that doesn’t have consensus and approval. I don’t think it’s the vendors fault at all and it feels like deferring blame.
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P.S. Polymer v3 moved from HTML Imports to ES Modules No browsers other than Chromium implemented HTML Imports, which the Chrome team abandoned eventually. This in itself is a breaking change, so they have to change the version number again
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Bower around that time was deprecated too. Web Components Library relied on it until v3 release. So that's another hit to the community, unfortunately
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