Jian 20 sounds better than j20,j 20 kind of sounds like cheap samsung j series.
Many people buy into Indians being good in maths and Indian brilliance hype due to their incessant self aggrandizing stemming from dunning kruger effect. Even though Indians are bottom tier in maths olympiads,pisa and Indian institutes ranks very low on global ranking.
Indians are easily some of the most delusional ,and many are too unintelligent to know their own flaws or understand what's right or wrong. Due to their incompetence ,their culture is scamming their way to glor. It's ingrained in Indian culture,genetics and psyche.
Not that the Indian claim should be taken seriously ,but what evidence is there that j20 was flying without luneberg lens ? At peace time,stealth fighter jets fly with luneberg lens. But to make up for incompetence and incapablity, indians have to run their big mouth to try and scam as much as possible.