Yeah people just don't realize that Goa is not just KR but also other places majority of KR just serves North Goa whereas South Goa is served by SWR route.
I have travelled frequently in Goa express and have seen many end to end passengers in it also many Goans travel to Pandharpur in it by getting down at Miraj and Shirdi pilgrims by getting down at Kopergaon.
For VSG, SVM, QLM and places nearby to it Goa express is a dedicated connectivity to Delhi its my personal experience as a Goan native.