What is the relevance of Incoming/Outgoing quantity columns in the Product tab?

The columns - Incoming/Outgoing denote the following

Incoming Quantity - this is the quantity for which an Order or a Bill is created but Goods Receipt is pending to be done

Outgoing Quantity - this is the quantity for which a Quote or an Invoice has been created, but Fulfillment is pending

What is its relevance?

While planning procurement of a particular stock item, it is advisable to consider the Incoming and Outgoing quantity as well in addition to the Available Qty to understand how much quantity we would have once the incoming & outgoing quantities are realised. This helps make a more accurate decision on the quantity to be reordered