Untrue. I have personally cared for several applications that have lived from Rails 2 through to 5 - and most of the code hasn't needed to be touched. Sure thi

Untrue. I have personally cared for several applications that have lived from Rails 2 through to 5 - and most of the code hasn't needed to be touched. Sure things change - hashrockets are out for example - and I have regexed the codebase a few times, but the core business and presentation logic has stayed the same, and the process has been fairly painless, even when skipping a version now and then.