[CogitoCogito]

I don't understand why this is being downvoted. I would love if metric were used universally, but I don't really see any difference between that and wanting a single language to be used universally. In fact, the cost of different languages is certainly much higher than different systems of units. Converting between systems of units is just trivial arithmetic after all.

[lukan]

Because SI units are part of the language of science and communicating about rockets involves the language of science.

[notahacker]

Also, SI units aren't some niche idealised standard like Esperanto, they're more widely used than the English language...

[ahoka]

Because it is a false dichotomy.

[goku12]

False analogy, in fact. The explanation is in my direct reply to the commenter.