[unexpected]

I would expect a book written in French to follow French conventions, unfortunately, in English (American), a space would read as very confusing!

[germanier]

The space is actually recommended by international scientific convention (as it is the least confusing option) and also required if you follow the (American) AMA style.

[speps]

It's a next generation book, it should understand my locale and translate units automatically. How about that?