well as i said that i agree with you that india should have gone ahead & bought the S-400, simply because at rs 10,000-crore they would have a ADS which can track & engage targets 400km away, whereas in the israeli system they will have to be satisfied with 120km.
if any ADS is to be bought from the israelis then it should be the SPYDER ADS for short-range & mobile platform
you are right , while the russians are providing us with already proven technologies, india is more keen to re-invent the wheel so as to say
but what to do ??? in india weapon systems are chosen not on the basis of merit but What "revenues" they would generate for the deal-makers & politicians