I think what your describing is mainly your preference - which isn't in itself a bad thing, the lack of real diversity in browser scripting is a problem that is slowly being solved as WASM becomes a more viable target.
That said, some of your statements seem to be simply false. Javascript engines are at this point about as heavily optimised as Java and .NET runtimes, and a quick scan through a few benchmark sights seems to indicate that, with a few exceptions, the two perform similarly well. Certainly, there is no guarantee that a naïve implementation in Java will necessarily be faster than a similar one in Javascript, in the way one night expect with e.g. C and Python.
Moreover, JavaScript is regularly used in all sorts of applications and systems - Gnome, for example, uses JavaScript for various plugins and utilities, an increasing number of applications are written using Electron or other webview-based technologies, even browsers use JavaScript for a significant number of controls (e.g. the devtools for most browsers are written in JavaScript). So clearly a lot of people see value in writing all sorts of applications in JavaScript.
The rest of your complaints seem to be largely your opinion - again, perfectly valid, but other people will have different opinions, and so the value proposition for JavaScript will be different for them. For example, for me, building something in React is a cinch, whereas Xamarin would take a lot more work. And the ecosystem of JavaScript may not be perfect, but it's very well oriented towards building front-end apps, something that isn't as true of Java.