Well during the 90,s we could not afford the those models and the soviets did not offer us the superior model. In early 90s Army planned for upgrades but our economy didnt support.
Since now we could afford it now we are engaging in The 'gold standard' upgrade package' which includes:
• A new fire control system: the Drawa-T from PCO-Cenzin of Poland. The Drawa-T is present on the Polish PT-91 tanks, their much improved variant of the T-72, and a muzzle reference system.
• A thermal imager integrated with the Drawa-T fire control system, supplied by Israel's El-Op.
• New radios: DRDO's and BEL's (Bharat Electronics Ltd) state-of-the-art frequency hopping combat net radio, to be manufactured by BEL.
• A fibre optic gyro-based navigation system: BEL's advanced land navigation system.
• Laser Warning System: Designed by DRDO, BEL and Indian Industry, to be manufactured by BEL.