I presume that's believe in the sense of faith, rather than believe in the sense of drawing reasonable conclusions from evidence. In other words, what are those advantages, and how do you know they exist at all, let alone their significance? As I recall, Amazon did pretty good during Work From Home, so why not start with the hypothesis that WFH is actually good for Amazon, then try disproving that with evidence.
If their Return to Office plan is itself a secret experiment to do just that, I apologize for jumping to the conclusion that they are making decisions under a combination of the sunk cost fallacy with respect to their commercial real estate, and the insane impulse to satisfy their management layer, while simultaneously shrinking their overall workforce size.