I've not used Svelte, but when I've used such DSLs the problem tends to be that they're not very flexible, and as soon as you step outside of the provided helpers you're stuck and you just can't do the thing.
Do you have an example you've run into where a DSL such as Svelte's or Vue's has actually stopped you from doing something? Would be genuinely interested to see it as I've never run into such a situation myself.