I passed the video to GPT4o through Kagi and then asked "What is Hotwire and how does it work?" and got a satisfactory write-up. I can email it to you if you'd like (I think posting LLM generated text here is frowned upon).
It does once you dig a little into the documentation, you need to click past the first two pages of self-flattering and you’ll see that it’s mostly just going back to writing old world JavaScript.
Yeah your comment ironically points out the issue (at least I have) with this - you are maintaining state on a server, and so messing with a UI isn't just dealing with local UI state.
I'm no JavaScript fanboy, but I'm also not bent on avoiding it at all costs shrug.
Surprised something like this wouldn't have any example code or demos to look at.