In all practical terms i absolutely agree with all you said. We are stuck with the practical everyday physics we have. Sadlywe can never make a scale plane that performs in a trully scale manor in all aspects so we just make compromises and achieve the best we can..

However as a point of academic interest if nothing else, on theissue that 'a second is still a second'.. This would seem like you are saying time is a universal constant, the same for all. Einsteinshowed this not to be the case with his theory of special relativity.. Time just like distance, size and mass is relative to the observer and could be measured differently by different observers.