Not what I’ve been told. Hazen-williams is still used in many models as well as Darcy-Weisbach. It’s just hard to do the figuring with this stuff.
I can see if you have a fire hydrant on a 6 inch line and say it has 80 psi, the hydrant gets hit by a car and breaks off. As a plumber, all I should care about is that a lot of water is going to come out of the ground and it needs to be shut off before I fix it. Why do I need to know how to figure out how much water is wasted? I ask my instructor and it’s just part of the classwork to him, needed for my license test. Maybe engineering is easier….