system packages and maintainers in current day are not used to support mixing multiple software with an easy separation like RVM does, they put everything in one prefix like /usr and change only application suffix, it works well with alternatives-update - but it’s static switching of ruby, what developers need is runtime switching and clear separation of libraries per language, the lack of clean separation also is bad when deploying servers that run multiple versions of given language (not limiting to ruby)
also check the update with schedule - https://www.bountysource.com/fundraisers/489-rvm-2-0 - "2 months: Work on building packages using RVM 2 (so it deprecates itself)"