Really? It's hard to parse the year??
What about when you come across a piece of paper written some time ago, is it not useful to know the year?
> most people convey to others that this box is 12x8x8 inches
"Most people" == nobody outside of the US.
> And no one uses decimeter (10 cm) for some reason which is actually nice since its the size of the index finger
I just measured my index finger. It is 8.45 cm.
Replace inches with cm, I didn't explain it well. Even if it is centimeter, people would tell dimensions to others more than convert them. The point was about frequency of communication between humans vs. frequency of converting units.
You seem to be taking offense that I said something US-centric. I didn't mean that at all.
Is it so hard to write "it is?" Nevertheless, you used a contraction.
You did so entirely unconsciously because that's how langauge works.