For me, that's icing on the cake. Why I truly like and recommend Svelte is its ergonomics. Paired with Sapper, building a fast website is a breeze and feels like you're just writing plain HTML and (supercharged) JS.
I hear that this is something they are looking into adding support for
Small projects / websites = use the DOM
SPAs = use React
Why would you use Svelte for small websites when it requires JS?
All of my "websites" are made w/ pure HTML/CSS/JS and the JS is optional.
All of my "apps" are made w/ React (Web, Electron) & React Native (Windows, iOS, Android)
I'm working on a stack that sets all this up for you so you can get started on deploying for every platform. I already use it in production.
Don't cheat yourself, use React and take advantage of the progress and ecosystem. If you don't need that, then use vanilla.
Svelte gives you the exact same tools. I've been building React-based applications for years now and have been using Svelte for some projects on the side and in my opinion both are decent tools. Some of the Svelte "sugar" is easily replicated in React, it's just that React doesn't provide those out of the box; on the other hand, Svelte has some "gotchas" that don't appear in React.
Though, perhaps you mean the larger React ecosystem. But still, what patterns are you talking about? TEA/Redux? There's no reason why you can't use the same patterns with Svelte.