Description
This really appears to be a laravel issue with Symfony Console 5.3.x, so I'm not sure there's anything you can do. Reporting this issue primarily for others looking for the solution.
When attempting to create a new site using the CLI, I got an error "The no-ansi option does not exist."
Based on this answer on stackoverflow, I downgraded the composer Symfony Console module globally with composer global require symfony/console:5.2.x and then composer global update, although the last step seemed unnecessary.
After this fix, running the statamic new <site-name> command again worked as expected.