I wouldn’t get too excited about it to be honest. At one time they were also supporting Vue but it is now basically abandoned.
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With so many frameworks out there it's infeasible to build custom wrappers for them all. With web components they can build once, and work everywhere. It's only up to the frameworks to make sure they have great web components support (which just means great HTML support).
Web components are a mess but this is a great application of them: shipping reusable components that work in all frameworks. It's the one and only killer application of web components.
Frankly I'm surprised they're marketing this as "for vanilla javascript" and not as a "now supports all frameworks" type positioning.