Magento 2.4.2 , .3, .4., .5, etc. updates are all done via CLI commands and PHP COMPOSER. This is how the new Magento versions manage extension and component updates. How will Modern Retail updates be managed? Composer?
Currently, Modern Retail does not use Composer. Instead, our Magento Extension is typically updated by either our Support Team, or the client. When it is updated by the client we either give them a copy of the latest extension via Zendesk (our help desk tool), or they get it from our public Git repo.
If you have any additional questions, please feel free to contact us with a support request.