'Fill Form Fields' - what the purpose of this Method


I noticed that many Aras Forms use a Method called 'Fill Form Fields' in an onFormPopulated event. 
Many ItemType Forms share this Method, e.g. Part, CAD, Document, ECN, PR,...

The Method itself is very simple, it updates the value of major_rev, state and cost as soon as somebody updates the form. But when I disable the Method, the behaviour of my Forms do not change. Everything is updated like before.

So I wonder, if we need that Method at all? I assume this Method was necessary in the past for some technical reason, but is there still a reason why we should use it in the latest Aras versions? I use SP11, but I assume 'Fill Form Fields' is also present in SP12 and SP15. 

I want to avoid that too many Methods are triggered when I open a Form, so I want to get rid of everything that I do not need 

Maybe somebody has an idea of the true purpose of 'Fill Form Fields'?

Thanks and regrads!

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