> The transitions are supposed to indicate agreed-and-defined steps that work goes through. They're supposed to reflect your team/org process, to the granularity that you want to capture it in Jira. Letting anyone edit them ad-hoc is akin to saying there is no process at all for doing work. How would anyone be able to interpret the state of work if everyone has their own ad-hoc process that they can change on the fly?
Everywhere I've worked the states have been the steps, the transitions have just been there for Jira's own bookkeeping. And in the real world it's always possible to move a piece of work to any other step in your workflow - things like "the designer's realised he messed up the wireframes, put it back to design even though it was currently in code review" happen all the time. I don't think that's the same as not having any process.
In the Jira way of doing things you can't do that if that transition doesn't exist, and you probably don't have the required permissions to add that transition (if you can even figure out what they are). Couple that with Jira's terrible performance and I've been in more than one company where you could accidentally drag and drop a ticket to the wrong column (because Jira decides to finish loading at the wrong time) at which point it's permanently fucked up and your only option is to copy and paste the data (one field at a time, natuarlly) into a new ticket.