Filesystem overhead notwithstanding, it's worth noting that NAND flash usually had true capacities too, with some additional hidden extra for error correction/wear-leveling. I have a 16MB SLC one that truly has 16,777,216 usable bytes (32M 512-byte sectors), and a slightly newer 2GB one with 2147483648 bytes.

Let's not forget the original IBM PC "10MB" hard drive held a little more than 10MB: 10653696 bytes, a bit more than the 10485760 one would expect.

No one seriously talks about "GiB", and the only ones I hear using it are pedantic assholes. It just sounds absurd and stupid.

As for JEDEC, standards bodies are made of people and people are fallible.

I can say the same goes for SI and their "iB" nonsense.