I haven’t done much React, but I’ve played around with svelte a bit recently and I haven’t found any severe issues with the props model. What don’t you like about it?
The most important thing is it makes it difficult to build the same tooling that other frameworks have. For example, in React you can either define your props as a TypeScript/Flow interfaces or use the `prop-types` library. This gives you an easy way to automatically validate props outside of the context of component instantiation. For example, you can do:
import MyComponent, {MyComponentProps} from "./MyComponent"
const props: MyComponentProps = {...}
import {propTypes} from "./MyComponent"
import {propTypes as otherPropTypes} from "./MyOtherComponent"
const MyNewComponent = () => {...}
MyNewComponent.propTypes = {...propTypes, ...otherPropTypes}