My favorite example of redundancy is the US requirement to have two staircases in an apartment block for the case of fire.
Most other developed nations do not mandate this, one staircase being considered enough. And they don't have an epidemics of fire deaths either. In general, frequency of fires in domestic settings is a fraction of those 100 years ago.
If Switzerland or Czechia can live with one staircase per building, so can the US. This alone would reduce costs of construction somewhat, and make some currently illegal construction projects legal.
Most other developed nations do not mandate this, one staircase being considered enough. And they don't have an epidemics of fire deaths either. In general, frequency of fires in domestic settings is a fraction of those 100 years ago.
If Switzerland or Czechia can live with one staircase per building, so can the US. This alone would reduce costs of construction somewhat, and make some currently illegal construction projects legal.