> Vapor Mode will only support a subset of Vue features. In particular, Vapor Mode components will only support Composition API and <script setup>. However, this supported subset will work exactly the same between Vapor and non-Vapor components.

> Building an app with only Vapor components allows you to drop the Virtual DOM runtime from the bundle, significantly reducing the baseline runtime size.

This seems like a clear push in the direction of Solid and Svelte in this area.