The "Custom"/"Everything" install has always traditionally included alot of language specific packages that are not needed/desired. I propose that the choice(s) made on the Language Selection page be used to filter the package selection process of the "Everything" install so only the desired language packages actually do get installed. The Language Selection page of anaconda already has a "Select All" button for those who truly do want "Everything" to mean literally everything (IE: i18n developers), but it should reduce the amount of bandwidth used to update via RHN or other methods where the customer cannot possibly use the information contained in packages designed for languages they do not understand. If time permits, further filtering could be done to not install packages that are used only by languages that are not being installed. Chineese/Japaneese input methods and editors come to mind, but this may lead to a a rat's nest of dependencies that may be more difficult to filter.
Everything is *all* packages. Not all packages but some arbitrary subset that some people think makes sense to split out as a group not belonging to everything.