SAP C4C Opportunity Won- Lost , still editable

Dear All,

Sorry for this naive question but is it a standard funationality that even after Sales Opportunity is won or lost , we keep the opportunity object editable?

I always thought we need to Set it in process again and than only user can edit it.

Can someone please let me know the business use case of keeping opportunity editable even after won or lost?

BR

Dhruvin