Why would you need a computer to divide measurements? I have never built anything so large that I could not do most of the math in my head. Or a pencil and the back of a board if more complicated.
I guess the difference is that you grew up with inches and I did not.
Calculator, or computer same thing. I normally keep my drawings on my laptop, so it's always in the shop.
One of the biggest challenges we always faced, when I was is in this business with my father, was teaching craftsmen how important accuracy in woodwork is, when building complex furniture.
Those who were hard headed, learned the hard way on a bigger job, when a 1/16" inch in the wrong place gave them 1/2" out somewhere else and it was not fixable. It can also make the difference between tight unstressed joint lines and joints with gaps.
When setting up a furniture factory for mass production, 1/32" will not cut it. Imagine having a auto process cutting strips out of a 8x4 plywood and each is out 1/64" on the one side. When the last is cut, we are totally out of square.