As a general principle: no entity can be optimally efficient at more than one thing. The more limited the goals, the higher one’s chance of efficiency. A multipurpose machine – human or corporate – is always going to be less efficient than one which is dedicated to a single purpose.
Our brains are not specifically designed or evolved to be maximally efficient at one thing. Instead, this cognitive and emotional machine is profoundly generalist – it comes moderately well equipped for a huge range of possible activities