" Sterility is one aspect that is not mentioned here for obvious reasons (brevity)."
Well, so much for the first sentence disclaimer.
A TDS meter is not a toy. Live with 450 ppm TDS and watch your water heater, pump, fittings, and valves (shower head too) take a beating.
USA coin operated water jug dispenser. Found 230 PPM. Here, it is over 400 ppm, and you bet your sweet butt the water ruins stuff.
When I go to a new place I want facts not guesswork or gossip. A pen size TDS meter is worth it's weight in gold. If a 2-second test is too much work for some let them support the water supply repair parts industry.
Water sterility like I mentioned is another whole ball of wax. In descending order from large to small, amoeba, bacteria, virus.
Some dissolved solids are mean. Lead, Cadmium, lithium.