I would argue the opposite: you should always use rvm (or similar) in production. I've done this for many projects, it's great to have the same ruby version and

I would argue the opposite: you should always use rvm (or similar) in production. I've done this for many projects, it's great to have the same ruby version and patchset in development, CI, staging, and production. rvm is also well supported in capistrano and jenkins.