Rails 7 is looking really promising. Will make teaching Rails much easier in a bootcamp context. JavaScript was always a little strange in Rails but this will make rendering JSX in a monolith Rails app easier. The way that DHH installed Tailwind also looked cool! I remember having so many troubles trying to install Bootstrap and being able to just do the install a CSS libary via the command line in a rails new is 🔥. So much better for beginners who likely want to use one of these libraries.
Sidenote: esbuild is also insanely fast. Need to give it a try sometime for my React builds. This tutorial provides a good walkthrough for using a tool called CRACO and changing the build scripts in package.json.