The metric system is a "worse is better" approach. Why is Kg, a base unit, even if it has prefix?
Time in the SI is based on seconds, that relate very odd to the duration of a day.
The same horrible base60 system is used for angles.
Don't use SI. Use a system that fits for your Problem (e.g. the cgs system) Use Units that make sense (like Angstroms or barns) for the problem you are solving. Often SI fits. But SI shouldn't be a dogma.
Don't go fooling yourself into thinking all systems are equally complex just because all systems have sone complexities.
I've read a at least half a dozen studies linking the US standards system to worse learning outcomes. Nobody's saying SI is perfect. It's just a lot, lot less worse.
Of course the US or the Imperial System are a way worse, I never meant to imply otherwise.
But SI is not particular good and it's not a non-brainer to choose SI. Units should be used because they are elegant to use. Like Angstrom and not because they are in the SI system.
And there are other Systems that are just as valid. Instead of SI-Prefixes one could use Japanese numbers. (They have names for the numbers 10^n for n from -24 to 68 in steps of 4.)
Time in the SI is based on seconds, that relate very odd to the duration of a day.
The same horrible base60 system is used for angles.
Don't use SI. Use a system that fits for your Problem (e.g. the cgs system) Use Units that make sense (like Angstroms or barns) for the problem you are solving. Often SI fits. But SI shouldn't be a dogma.