No, it's not. You fly into busy,one way in, same way out mountain airports and needlessly follow the RA on the aircraft you've seen for the past couple of miles, you're asking for trouble. Could you be seeing another aircraft, yes but the chances are greater the RA will introduce a threat than resolving one. This especially so when both are talking to the tower in Class D airspace. I've been in the situation where id have been put into a precarious position had I followed the RA, the other guy (which I've been on many an occasion) is now placed into a position of having to fly an emergency terrain extraction needlessly at places like KASE.
Few rules or conventions is so universal that you can say something is an absolute or "end of story" to use your words.