Lack of operational reliability due to economical instrumentation?

Hi, in recent decades, automobile construction has made enormous progress, but one aspect seems to have somehow remained on the road: the instrumentation of the vehicles. Today, apart from tachometers, tachometers, tank clocks and cooling water thermometers, one is rarely offered more (and some manufacturers are already starting to save on the cooling water thermometer). I believe that at least the first two of the above instruments are indispensable, but one knows how important correct temperature and pressure of the oil are for a long engine life. Since the instruments and their donors do not cost a fortune, I think it is simply for saving in the wrong place, if these instruments are partly missing even in vehicles beyond the 40,000 euro price class. What are the manufacturers doing with the waiver of a proper I Should people often buy a new car, because the old car made the greaves, because he was beaten too often already shortly after the cold start into the limiter…?