I'm a fan of the #standardrb gem, but so far the https://github.com/rails/rubocop-rails-omakase gem that's the new default for Rails 7.2.0.beta2 isn't too bad. Many of the tuned defaults work well out of the box. The only rule I vehemently disagree with in my testing so far is adding spaces inside Array and Hash literals.

This can be modified, of course. My point is that the defaults are pretty sane compared to the usual out of the box experience with untuned #RuboCop.