So if we go with your logic Aravali shouldn't have been extended. Jaipur alone was enough to make it full still it got extended because parking problem is real bro. Don't tell that Jaipur has Gangaur too jaipur ears 10x than Bikaner still they extended not only Aravali but marusagar Dayodya and many more trains in the past and they are willing to extend many trains including 17019 20 when the occupancy of this train is 140%. And they extended JP MMCT duranto because of same problem.
Railway works with logic and politics bro not with mere emotions that particular train is someone's private property. Trains you are telling parked at different stations would have got extended too had there been...
more... any nearby stations to accommodate those trains SGNR is full and Hisar is in the same directions for most of those.
HMH washing line got sanctioned because of some reasons and if you think it's only because of politics then extention of train is not a big thing for the politicians.