"Among other things, when I build things it's useful to divide in half a few times, which is easier with inches and feet."...

If you find it easier to work with base 12 than base 10, you are not like most of the people.

"And I've found no benefit to Celsius's 0 and 100 coinciding with water's state changing."

So the fact that pure water freezes at 0 and boils at 100 is of no benefit to you?

I don't buy it.