So it seems to me that the only reason companies like Google would mandate the return to offices is because they see a greater cost in having employees work from home. Are they afraid of the cost of lost happenstance collaboration being so high and not trusting in technology (some of which Google built) to bridge that gap, or are they worried that their employees are slacking off?
Personally, slacking off when working from home would not be unimaginable, but more often than not, I may work longer hours from home as I won't have the commute burden or feeling that it's time to finally leave the office, so it's actually easier to get carried away. Admittedly that has other mental health implications, but not ones I would imagine most companies considering the cost of.