True that it is not uncommon to use Sidekiq or Resque , but Rails 8 is going to be the first version to ship with a queuing system (SolidQueue), later this year. So queueing has been an add-on for 20 years. I don't think it is quite a staple.
Rails 8 came out in November, and `rails new` generates an app with the solid trio in the Gemfile. Been fun playing around with it for new side projects :)