One big selling point on vue is that you can just use a tag script and map a vue object on your regular HTML page.

Ne need for build steps. No need for html in the JS script.

It feels like JS from the 2000, simple and light, but with reactivity and speed.

Of course, once you need it, you can just use the awesome ViteJS to get your backend build with SFC files.

This makes vue scale up, but also scale down, which is equally important.

Svelte seems to be set on having a server side build process for the front end. That is an even bigger no-go for me.

The complexity of React and the OPs framework at least be contained in the frontend. With a server side build step, the complexity of the frontend spoils over to the backend.