I am not saying about deprived area , i am saying change of terminal change, Singrauli to patna via route you mentioned will be absurd , though time will be same but pax need to shed more money for 150 km.
Chunar to chopan i always see as a bad planning they could have made it to mughalsarai.I always wonder despite being in proximity to mughalsarai why puny place like chunar made junction. Even the mirzapur would have better rather chunar.