I guess it does depend on what your job actually is, but as a rule I absolutely loathe this culture of presenteeism that means productivity and usefulness in the workplace depends entirely on the number of hours a day you are glued, unspeaking, to your computer screen. I get that some jobs require a 'constant' presence and, certainly when I worked in the NHS, turning up late for your shift and/or making a cup of coffee when there was urgent work to be done was out of order. It genuinely inconveniences other people/colleagues and that's not acceptable.
However, in my current job, no one suffers if I get into the office and switch the kettle while I wait for my computer to grind into life. We don't lose money (god forbid), no one is inconvenienced at all. As long as my work is completed on time, as long as my students are happy, as long as I pitch up for meetings when I'm needed, as long as I contribute to the department, who gives a shit if I'm drinking coffee while I'm at it?
It's so shortsighted of bosses to demand robots for workers. There is a ton of research to say that people are more productive when they're happy and respected within their work environment. A sense of autonomy is incredibly important for, y'know, sentient adults.
I'm working at home this morning and then will head into the office for a meeting at 2pm. I'll be guzzling coffee, as will everyone else. We will, somehow, believe it or not, still manage to get some work done.