The data flow issue I think is orthogonal to Custom Elements / Web Components.
Rob Dodson

Re point 1: the problem being that the moment you introduce a specific data flow solution, the “interop everywhere” argument breaks. However components without data flow are much, much less useful, so we have a dilemma.

Re point 2: what happens when you have 20 custom elements that all depend on the same library? Do they all bundle the library so that we end up with 20x duplicate payload, or do they externalize this burden to the user (by forcing the user to include the library globally)?

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