No, but they do have different team members working on different aspects of a system. Anyone on my team can rename some API function and break existing code. Concerns of a Ux Designer doing it aren't any different.
>I would hazard a guess that the majority of dev shops out there do NOT have a designated visual designer(s) and separation of coders from visual designers for the UI...
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer