Not sure about Amazon, but I work for a big US corporate that is making similar noises. I suspect "sometimes" basically equates to how much your more immediate management chain wants to keep you around, because after a few steps up the chain, you're PYs and percentages rather than an individual. Your more immediate management would have targets, but if 80% of their group's hours are logged in the office, it probably doesn't show up as a red light higher up.