On one hand, I hear you, because Rails has focused on the server side.

On the other hand, Rails has had client-side opinions basically forever; when I started using Rails during the 2.x days in like, 2009, there were helpers that injected JavaScript to make forms better, Rails 3.1 included the asset pipeline, an attempt to compete with webpack, in 2011. Even the current generation of these things has been around for a long time, Hotwire is four years old at this point.