I would rank plumbing pretty high to be sure, but without the steam engine to drive the water pumps, plumbing is limited to aqueducts, gravity sewers, and intermittent, low-volume supply from animal or wind-driven pumps.
Even today, the overwhelming majority of our energy passes through a steam phase at some point. Steam power is by far the most important discovery/invention of the modern world.
I would rank plumbing pretty high to be sure, but without the steam engine to drive the water pumps, plumbing is limited to aqueducts, gravity sewers, and intermittent, low-volume supply from animal or wind-driven pumps.
Even today, the overwhelming majority of our energy passes through a steam phase at some point. Steam power is by far the most important discovery/invention of the modern world.