This is along the lines of other ideas for exporting theme/layout CSS. This idea would allow the export of all CSS and have file and layout options to specify a URL where the files can be downloaded.
This would allow leveraging a CDN to quickly deliver the CSS to clients. Alternatively, the CSS file could also be stored local on a mobile device.
This is to support better performance of layouts with a lot of objects and files with many layouts over WAN.
Yes, there are issues to consider in developing this way. Any changes made in the theme or layout would need to have a refreshed CSS file. This should be a developer choice with the option to function with internal FM CSS or external CSS files.