Regarding productivity, if someone does their best work at the office communicating with other people but prefers working at home, wouldn't they fall behind their colleagues when they opt for a WFH setup? And if they're still happy in that case, who are we to say they have to change the way they work? So let people realize that the decide for themselves instead of doing the reasoning and making decisions for them that they may not agree with.
Regarding social interaction, getting surrounded by other people at times is nice, since we're inherently social animals, but why would we utilize work to fill in that need? Getting isolated for an extended period of time would drive me insane, but getting surrounded by other people, who I may not be comfortable with, would also do the same to my mental health.
As for my case, I have found that people can disregard the practices we have developed in the WFH era since they can "communicate faster" now and that has been giving me lots of headaches lately. So when people say they are more efficient at the office, I automatically associate that with the tendency to ignore clear, coherent documents because people think they are "cumbersome".