I don't know what I'm talking about, yet I build slick UIs for a living. Ok.

You are advocating for every action to take a server round trip to render, a client UI that consists of some hobbled-together mess of client JS, endpoint-rendered HTML, and worst-of-all extra server infra in order to facilitate it, when your client presents you with a perfect execution environment for a single application to transform data into semantic UIs.

I doubly enjoy that you didn't answer my earlier interpretation of your proposal, nor name any specifics of how you work, instead opting to swing back by once other people had sufficiently derailed the conversation.