Fair point on shadow DOM. That said, µJS targets server-rendered HTML workflows, where pages are plain HTML generated by a backend framework or template engine. In that context, shadow DOM is rarely used, so this limitation doesn't affect the typical µJS user. If you're building heavily component-based UIs with Web Components, µJS is probably not the right tool anyway. A proper JS framework would serve you better.

On the native APIs: yes, the Navigation API and Speculation Rules are exciting, but browser support is still uneven. µJS works today across all modern browsers without any configuration. That said, I agree the gap will narrow over time.