That is the core difference between academia and business. Any engineer who sits back and stares out the window thinking is reprimanded or even fired by the managers for not working.
Hmm... as an engineer in industry, if I decide I want to take a walk in the middle of the day, I make sure I don’t have any meetings, then I get up and leave. There are a lot of differences between academia and industry, but this isn’t one of them. I can’t imagine working for a company where I was worried about something like looking out a window, or not appearing to be working.
I know a lot of engineers who take walks and stuff and still keep their jobs. As long as they’re not skipping out on meetings and actually getting work done at some point, I don’t think it really matters all that much.