What documentation? Haven't seen that in years!

Don't know what type of engineering you are referring to but I work in Structural Engineering in the US and nothing gets converted to SI and back. That said, I would much prefer using the metric system.

As a programmer, whether I like Windows 10 or not it doesn't really matter. I'll have to support my applications on it so I might as well use it so I know it. I'm on 8.1 now and don't have a problems with it, going back to the start menu on Windows 10 really slows me down now that I'm used to not using it. Personally don't see the big deal, rarely used the start menu in Win7 either.