There are a very small percentage of people who can work from home at all. Even most of these need to be in the office some percentage of the time. Data entry and call center work possibly being exceptions. Most people who need to be able to exercise independent judgement are going to want to have regular in person contact with both their superiors and subordinates. Getting everyone in a room and hashing out a problem works a lot better in a real room than a virtual room. Bringing my long winded pontification to a close, I would expect that there will always be more hours being worked from home then there were in 2019, but I would be shocked if there were ever really more hours being worked from home then there was in 2020, and I would be fairly surprised if we ever got back above 2021 levels, at least in my lifetime.