From experience building more complex apps in Svelte, I can say that this has not been my experience, & doesn't accurately depict React in practice. Three aspects that make it really killer – a really great story for handling app & component state cleanly regardless of complexity, a great style scoping story, and powerful transition / animation primitives that fit neatly into the idiom – has made it easier to build large data apps than I've found with React (which I also use).

Another aspect I have really appreciated is that I have substantially fewer dependencies, since there is more included in Svelte than in React. I tend to only use d3 utility functions (format, scales, etc.) & immer (which I pair with svelte stores to get something kind of Redux-y, which is great for other devs jumping into Svelte from React-land). Fewer dependencies means I'm less likely to encounter awful dependency hell.

Generally, I feel like every time I see a Svelte thread here, there's a lot of random noise, but it's good to listen to the folks who actually use it. There are situations where it makes sense, and situations where it probably doesn't. The main reason why I might not use it is ecosystem friction – a lot of devs I know would prefer to just use what they know, even if it is painful relative to Svelte & friends.