Aggregating functions requires Xpath

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Why does aggregating functions(eg-sum) requires XPath source in a grid? Why cant we just add a sum option below an attribute of type int/float?
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2 answers
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I'm not 100 percent sure if this is correct but this question could be the answer.

https://forum.mendix.com/link/questions/22222

The question is talking about the export to excel and csv buttons, but the reasoning behind why you cant use those buttons for the "From Database" data source could be the same reasons why the aggregate functions aren't allowed with this data source. 

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Most likely because they're actually letting the database perform the aggregate function

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