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Because it makes work a nicer place to be and you spend loads of time there.
There are good ways to do this based entirely on the work relationship. Creating a healthy working environment is most of it. Making people feel obliged to share personal information is bullshit trying to hide the fact that the management aren't doing those good things. It shifts responsibility downwards and can be distressing for some.
I make genuine friendships at work and I choose my friends. I don't need some management consultant cunt with a Myers Briggs Ouija board forcing me to role-play.
Because it makes work a nicer place to be and you spend loads of time there.