To strengthen "corporate culture" is the excuse. But there is no Corporate Culture, there's just people, all the way down, and they're starting to get reeeal tired of this shit.
I am getting so tired of old managerial types pretending people are more productive in the office, the very place where old managerial types make everything about office politics to get ahead instead of their competitor getting ahead and about showing off who has more power by getting the bigger screen and about calling meetings purely so people don't notice that they are completely useless to the overall operation of the company.