At the scale of Amazon, it's hard to pass up even a single-digit increase in productivity. Furthermore, they're in a position where they have the clout and prestige to attract the workforce they need.
Remote work is still probably a good decision for smaller companies, where they might struggle to hire if they don't offer remote work. A less productive worker is still better than not hiring a worker at all.
At the scale of Amazon, it's hard to pass up even a single-digit increase in productivity. Furthermore, they're in a position where they have the clout and prestige to attract the workforce they need.
Remote work is still probably a good decision for smaller companies, where they might struggle to hire if they don't offer remote work. A less productive worker is still better than not hiring a worker at all.