Lots does. I work for a company that among other things makes leading edge ASICs. The tools and probes and things required to test and handle wafers and the chips that come back from packaging can't be sent to peoples' houses. Some people have to work various manual steps in that process at times. It's surprisingly hands-on, especially in early stages of characterization and yield and performance tuning.

The vast, vast majority of person-hours required to go from drawing board to bits of silicon running in customer's computer can be done entirely without physical presence though.

I know mechanical and structural engineers and it's much the same for them.