if a mc rogue wants to get closer to the saves achievable by full rogues then yes they should have to use up some feats, full rogues with a fairly high dex should not have to as the trap sense feats should put them over the top into the realm of saving a majority of the time, however a rogue who maxes out dex and trap sense enhancements and on top of that takes lightning reflexes should save on anything but a 1-3 when sporting gh and improved uncanny dodge