For everyday use all systems are good.
Measuring length in feet isn't any better than in cm/m.
When you grow up in a country that uses metric system you intuitively know how long 30cm is, just like you know how long a feet is.
The real advantage would be if the World started using one system. And if that was the case it would be metric, because that's what all the science and engineering uses.
Every discipline tends to use it's own units, which are most convenient for the application. That's why there's hundreds of various units for Pressure as one example. Atomic physicists use atomic units (au or Hartree) since it normalizes all physical constants to 1, drastically simplifying equations.
We don't use bar to measure tire pressure, we use PSI, since that application has simple integers ranging from 1 to 100. The Pascal (metric unit) for pressure is almost never used because it's tiny. Have you ever seen weights expressed in units of Newton?
Plumbers will often use inches or feet of water for pressure, since there's a simple relation to pipe heights and hydrostatic pressure. Classical thermometers will use millimeters Hg since that's literally the liquid that's in there. I could go on and on
Only very rarely are SI units actually used, because they're generally quite clunky. A kg is pretty big in alot of applications, a m is pretty long.
There's a reason the PSI tends to be the standard pressure unit in engineering for example. It's applicable. It's categorically false that engineers use metric
This post was edited by El1te on Mar 7 2025 04:21pm