System-Defined Fields?

System-Defined Fields?

Is there no way to work around deleting system-defined fields? Specifically, 'Closing Date'. In the Opportunity/Potential space, we do not always have a closing defined in early stages. 
I suppose we can just put the date out several months, but then we are putting inaccurate information into our system - which is not best practice. However, I do not understand how a system that is supposed to be customization would place fields in that cannot be removed if unwanted.

Please fix this Zoho.

Thanks,

Trevor