For me working remote has come with a mix of upsides and downsides. One of the main upsides for me has been mentioned a few times in this thread, and that's the fact that without having people physically present, your performance is now necessarily more tightly tied to what you actually accomplish rather than how long you're present in an office. This gives employees a lot more autonomy and freedom with how they spend their time as long as they manage to get everything done. No energy and time needs to be spent keeping up the unproductive facade of looking busy.

On the other hand, losing the ability to have spontaneous hallway conversations does cut out a lot of the communication that would normally happen in office. The signal-to-noise of these conversations may not be so high in terms of actually communicating purely work related topics, but they do a lot to foster a sense that you're actually part of a team with people you enjoy working with. With IMs and video calls, communication happens much more deliberately so coworkers feel much more like these virtual entities who you only contact for purposeful knowledge transfer. Perhaps some people actually prefer this and see it as more efficient, but I personally find it to be a somewhat dreary proposition.

Ultimately, I think what I would prefer is a flexible WFH policy, with maybe 3 days in office and 2 days of flex.