you must remember, panstir is only an low level air defense. It cannot do the 2 levelSee, the Chinese inducted the tor but never the pantsir wonder why. But also the pantsir has the ability to intercept the atgm or even the arm.
Defense of Tor. Why would you wanti complicate the logistic?
China has the abilities to upgrade the radar and system of Russian air defense to a much advance level. While India too are not satisfy with Russian system decide to go for a proven Israel system to meet future threat.The Russian sams were built in the Soviet era as multi coverage umbrellas. The Chinese have license production of the full spectrum of the missiles. Only made sense. Why the Chinese didn't develop new missiles, IDK, but atleast they have a way to fight America's planes, but expensive.
Its always interesting to note that India purchased the S-300 in small numbers but fell back on Barak 8 with Israel instead.