the examples probably avoid talking about the dynamic APIs because they are super ugly and very stateful. It's hard to say that Web Components are the future when your demo shows 200 lines of manual DOM reconciliation.
Sure, there is some pain but after years of several Angular and a Vue migration, I'd say that pain is much less than the pain of framework migration. People often overlook the experience of a framework for a long term use.
This could summarize every interaction I’ve had with Web Components since the beginning. Web Components are becoming the Nuclear Fusion of Web standards.