Sounds like a lot of extra functionality you have to learn, add, and use that still requires the user to wait for the backend to render a template.
I suppose what you have to learn and add is relative to what you already know and have, isn’t it?
What reason is there to learn Ruby and Rails and Hotwire and streams and turbo frames and whatever the next churn is just to avoid rendering some html with javascript?
No one is suggesting the industry immediately adopt some random new library, except for Rails fans who constantly demand everyone abandon a de facto standard like React and use their new toy.