[BrandoElFollito]

I am French (so strictly SI) and an ex physicist (so I like powers of 10). And I agree with you, especially for the temperature, and generally speaking for anything related to everyday life.

I think however that we must have only one referential because it simply makes things difficult when communicating (similar to currency rates). We should have chosen °F for temperature because they are more optimal (no changes for science, easier in everyday life) but metric for distances and weights.

Distances and weights are often added, which is a problem for non metric units. We all remember the train starting from one city at 13:45 and the other at 9:12 and the time they meet. Super simple in metrics, super hard in train time.