This page identifies a possible issue, concern, error, limitation, or bug!
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Probably not so fair to criticise something for not being something it does not claim to be, but next time someone claims that the MMA Entity system is somehow a replacement for decent OO do please show them this:
'It is important that at present EntityFunction can only return a scalar, but cannot return e.g. a list of values, an entity or an entity class.'
Visit also: Mathematica: The Entity system: useful links