I agree with you! I use the metric system in my professional life and it is so much easier. I’ll date myself - I remember the United States had a program to transition to metric, if I remember right in the early 70’s under Nixon. Highway signs had both miles and kilometers for example.
Actually, it was under Jimmy Carter, and there was an Interstate in Arizona that had distance in kilometers. I never saw that myself, though, as my travels were limited at that time. Apparently, Mr Grassley (still a powerful senator in a neighboring state) opposed the legislation, as did many citizens across the nation.
However, many of our citizens do use metric measure in our professions. The medical profession, for example. Doctors, Pharmacists & Nurses all learned to use metric measures for medication. We also measure fluids in metric (Intake and Output, for example.) Auto mechanics have had to use metric tools for decades to work on automobiles built in countries using the metric system. Many professional chefs use the metric system, as seen on many cooking shows on US television.