you're talking about early 1980s when starkids didnt even come in.
1st one was balayya as solo hero in 1983
appudu fans lo unna maturity, acceptability , ippudu fans lo ledu
babu culture marri chettu laga peragadaniki fans ye reason
last guy to become a star hero without filmy background was ravi teja and that was 10 yrs back after struggling a lot.
Nani is still struggling.
oka director or writer experience lekunda vaste, mundu assistant ga pani cheyamantaru.
oka producer matram singanamala ramesh laga black money tho vaste chalu.
oka hero matram family background tho vaste chalu.
ppl need to grow up.
certainly in next 3 yrs we'll see new set of heroes emerging by overtaking family packages
2006 nundi muduruna theatre mafia, heroes (caste based) blind worship by fans etc valla new talent never came into limelight.
infact tollywood made only formula based boring movies.
oka hero launch avvalante, oka lovetrack, oka comedy track, oka revengetrack unte chalu..
examples : nagachaitanya (josh), vaibhav (godava), aadi (prema kavali) etc.
nani came without family history , so he luckily got innovative script like ashta chamma