As far as I know, its not the range or drag which is that much of an issue. It is the accuracy. Can Pinaka reach 140-160 KM, may be. Can it hit the target at that range, doubtful.I think at higher altitude Pinaka's would be able to maintain if not 200km but atleast 140-160km range due to less drag during initial stages.
This is why I have my doubts about even Weishi rockets and maturity of their guidance kits. The only known use (to me atleast) of WS-2 rockets at 200+ KM range was by Iranian Revolutionary guards and lots of them missed the mark resulting in massive civilian casualties. This is why I always have massive doubts about Chinese capabilities.
One possible option for India is to use Prithvi II missile with a cluster / submunition warhead for wide area destruction. Prithvi II has a range of 350 KM or so and can carry submunition warheads. Also, it is not as expensive as Brahmos.
AFAIK, the biggest use of rocket artillery is in counter artillery operation, ie taking out the artillery support of your enemy. That said, nothing prevents it from being part of sledgehammer hitting a high value target. Infact, thats how Iranians tried to use their WS rockets. In the war on mountains, terrain makes movement harder and also targetting harder too (again, I may be really wrong here due to certain specific tactics or developments @Falcon / @vstol Jockey please correct me). A lot of shoot and scoot advantage of mobile rocket batteries like WS-2 is negated and their range advantage is also negated to a degree. So, I have my doubts about what role they can play.
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