David Kimura PRO said about 3 years ago on Hotwire :
This episode was on Ruby 2.7.2 and Rails 6.1.0. It's probably worth noting that I do have a .railsrc file which contains.

--skip-spring
--skip-coffee

This episode was also based on the version of hotwire-rails 0.1.0 and turbo-rails 0.5.0 at the time. They are moving fairly quickly with their development. What differences are you finding?