Potential - Closing Date

Is there any technical reason why the Closing Date field in the potential module needs to be marked mandatory and not able to be changed or moved?

I am trying to use Zoho in a B2C environment where I am dealing with a large number of prospects at any given time, and it is not only unnecessary, but often difficult to predict an exact closing date for the sale. It makes much more sense for me to simply track the amount of time that has elapsed since that potential was last moved to a new stage in the sales cycle so I can see how "stale" it is.

For that matter, why should any of the fields be marked uneditable by the user? I can certainly understanding setting things up in a default manner that is likely to work for a lot of businesses out of the box with relatively little need for customization, but restricting the ability to customize certain fields, especially those that are marked as mandatory and which force the user to enter data that may not be necessary or relevant only makes it less adaptable and in some situations limited in how simply and effectively it can be used.