I was looking to inheritance too when I began to play with Stencil and at first I was sad too that it wasn't possible.
Fast forward one year later, I've created multiple components and I'm even developing a full app only with it (aka "without framework") and turns out I was able to live without that pattern. Also don't feel my code is that uglier.
Just wanted to point out that according my experience, even if that would be cool, it isn't something absolutely mandatory or maybe you've got a concrete use case where inheritance is absolutely must?
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