Purely systematic, sure, we just go by ranking. But as we are also investors, and as such, sometimes we are aware of what is happening in a business, already have some knowledge about certain stocks, so we can add the element of intuition, thereby omitting a system generated stock and adding funds to the one which we have conviction. If we cant shake off the feeling, that is. Wearing the investor hat on occasion, so to speak.
If there is no such chance of adding intuition, qualitative inputs, no pattern recognition, only system generated, then we go by the system.
And, as what happens after we get the list cannot be predicted, diversification helps, particularly if we are allocating more capital.
AFAIK, people go by systems only if they have conviction as they have done the backtesting and are satisfied with the results. I have not done any, so I try to add my interpretation.
Haven’t reached the level of giving the responsibility to a system/machine, yet. Don’t know if I ever will be or if I ever want to be 
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