[nitrogen]

The difference with kibibytes is that they weren't discovered scientifically, someone (or some group) just decided to force SI prefix normalization on inherently binary units. Most people I know don't use power of two units anyway, though, so those two factors alone would definitely slow uptake.

Pluto is sort of the same, though at least there's an empirical justification in that there are other similarly sized bodies that shouldn't qualify as planets, so a consistent definition was chosen to exclude them and Pluto. But because it's a definitional change rather than a new discovery, people can be slow to adopt it.