I agree that I wouldn't change your current tooling, as the cost isn't worth it. JSX isn't that great. But even though it turns that HTML into function calls, there is still an expectation of how it will work: i.e. those functions will still produce the specified html. At the end of the day, writing a layout in html is so much more intuitive than using function calls. Makes me think of how MS introduced the XAML language when they created WPF, making it far nicer to build UIs out of code than in winforms.