React code looks so ugly to my taste. Try reading it: "use state zero". What does it even mean? And why "const" is used for a value that changes?
const [count, setCount] = useState(0)
I didn't understand how the compiler works completely, but I assume it tries to figure out the dependencies during compilation time ("The text of node Y depends on variable x"). This approach is closer to Vue's approach which uses proxies to find these dependencies in runtime, than React's approach which renders the new tree, diffs it against the DOM and applies changes. So it is unclear why React was used for input instead of Vue here. Furthermore, as I remember, Vue has templates implemented as HTML (including attributes for branches and loops) so it would be easier to parse than raw JS code used by React.
Another problem is that those dependencies are often unknown at compilation stage. For example, imagine a form which is generated dynamically based on list of fields received from the server and should show error boxes when invalid values are entered. The compiler won't be able to pre-compute the dependencies here because it doesn't know what DOM nodes will exist at runtime. I assume the compiler would figure out a dependency between a variable with list of fields and "form" DOM node, but not dependencies between entered data and error boxes visibility.
Sadly the website doesn't provide examples of generated code so I cannot confirm my guess.
Anyway, interesting idea. Sometimes I draft reactive frameworks on paper so I understand the challenges a little bit.
Also what I do not like in reactive frameworks as that they are invasive and require you to adapt the code for them. For example, I might have my object model (let's say a TextDocument class with lot of nodes inside), and all I need is a "View" that would display it. But React requires you to move the data into props and state, and sometimes use a giant immutable object that gets rebuilt on every user action, and Vue wraps everything with proxies which causes lots of small issues and confusion (like putting a proxy into the Set instead of original object). And also React requires installing Node and compilation which is too much for a one-page quick project. So what I want is that I pass my Document Object Model and framework just displays it without making me adapt to its architecture. For example, I pass a model of a text document and it just displays it. Without immutability, without proxies, and without writing a giant switch with all possible user commands (I think they call the approach with a large switch and immutable objects "redux"). I do not need redux, I just want to use classic MVC from 80s and not modern dubious ideas. I have M and C and only need a V.