I have worked in highly secure environments where ONLY RDP access was allowed. RDP access does make it much simpler and the real question is "do you trust the DBAs or not?" If the answer is no then why do you trust your system people MORE than your DBAs, people who specialize in the software? These people have VERY high level access, restricting RDP is not making you more secure, you are making it harder to do their work with no appreciable benefit.

CEWII