I recently refactored a form with complex client side interactivity for one of my clients replacing jquery with vuejs in the process and I'm absolutely baffled by how easier it is to reason about everything when you think of the UI as a function of the state. Only devs who have done both imperative and declarative DOM manipulation at some point in their life can understand the joy of doing this. And all of this can be done with just a simple script tag without having to bring in complex build process that has plagued the Javascript ecosystem.