I'm building a site where I want to allow guests to purchase without creating a user account. This appears to be default behaviour in Commerce 2.1 (the message stating that the user can create an account at the end of checkout is currently not implemented although I know work is being done on that in this issue https://www.drupal.org/node/2857157).
However, I also don't want to offer guests the option to log in, which is what currently happens.
So, I want to simply bypass the Login page and go straight to the checkout page.