Skipping Magento setup might result in conflict during runtime because Magento config will not be updated with a new port config.
This option can be used only if you 100% sure that the ports configuration is the same.
In a nutshell, this option enables start command will just restart services and PHP-FPM, so if you need to restart the project it can be done in under 10 seconds*.
--pull-images
Pull Container Images.
This is used for updating container images.
--reset-global-config
Reset global configuration for current CMA instance.
This will reset configuration that is set for some prompts that appears during setup.