This is the true power of the VDOM, to abstract the view from platforms.
Why be a web developer when you can be a cross-platform app developer?
That's why I don't use Svelte and other web SPA frameworks...
That does, however, require having properly designed your UI, with a knowledge of where the power of your framework of choice is. And that's where a lot of apps fail. Even something as simple yet critical as using vdom keys tends to (for various reasons) never register for many folks, leading to terrible performance.
I'd rather a small perf hit than have another code base for web. You get web for basically free when making a RN app.
That is for APPS you want your WEBPAGE to perform better, don't use a SPA, use Astro or something similar.
Might as well do everything in Assembly or C because it's faster right? Same argument. Development speed matters too.