The problem is that in the tech biz people tend to follow blindly without thinking. There was a point there where just because Pivotal Labs had some success pairing full time, everyone followed blindly. It’s the same with leetcode style interviews, open offices and ping pong tables - it worked for google and all of the sudden everyone is following blindly.
But personally, I wouldn’t work somewhere which paired heavily even if the benefits could be proved. I simply won’t do it because I don’t enjoy it!
Just like the choice to work remotely, the choice to not pair seems like a basic employee freedom that we should all have. Luckily, the way our industry is moving, such freedoms seem to be increasing.