Duplicate for https://community.rws.com/ideas/tridion-ideas/i/tridion-sites-ideas/coreservice-rest-additional-new-api-getitemasxml-1101292056

CoreService.REST additional new api GetItemAsXML()

Good to have CoreService.REST to have an additional new API GetItemAsXML() to return the XML response out of the Component.Content object. similar to our legacy WCF response. 

We have some use cases to use Fonto Editor to Integrate with  Tridion Sites, In some implementations, cases are already done based on WCF based on that XML response output, It will also help backward compatibility.