Why don't our filmmakers do proper research on the themes they select

I observed that our filmmakers sometimes get excited with some good themes and without any bare minimum research/study on the themes they jump on to direct them...like for eg caste oppression, issues related to religion..edho chepdham anukuntaru kani cut chesi chusthe adhe thokkalo fightlu , emotionsu... asala core ideas medha etuvanti fundamental knowledge lekunda edho pikedham ani cinemalu tistunaru manolu....

I definitely must appreciate sukumar in this aspect..he is the greatest of all time in tollywood to do proper research on the themes he select...take for instance

Jagadam - asala violence anedhi oka manishiki ela chinna vayasulone start avtundhani chala scenes tisaru... violence yoka aftereffects ni proper ga chupincharu

Nenokkadine - he has done properly research on human psychology for this film...I myself have posted twice here about the mask theme n sculpture detailing but sadly had to delete it n i also liked the detailing video done by thyview, interested may see it..u would definitely appreciate sukumar for it..

Finally what I want to say is , for the upcoming filmmakers who are here..pls do proper research on the theme u select..in that way ur art is going to stay forever...