I think it can be good and bad. The good is having someone you trust for support and no judgement. But, it can lead you to not make as much effort with others and if you, or they move on to other opportunities it can leave you feeling a little lost.
I feel it is important to have one, or maintain the same camaraderie with the whole team. Sometimes this can make it more competitive, and fun to work on
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You need someone to validate your thoughts and ideas and thats very human. A bestie at work does solve this social need in a professional env. Moreover, this does make work more enjoyable and incites collaboration among other team members but may end up making some people envy you as well :)
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