I don’t know if I’d be able to say I’m 10x as productive in Svelte as React (I havent used Vue enough to compare), but I’d certainly say there’s at least a 2x benefit, which is enough for me. Projects are easier to organise and thus plan, components are easier to build in an encapsulated way, routing works OOTB 99% of the time, and I don’t have to remember whether I’m allowed to use an effect or think about whether a hook is going to grind my page to a halt.