There is nothing like a Quick Reaction SAM and traditional SAM, all have same reaction time and velocity...ESAD turns off, firing signal is generated, squib is fired aur phir lagti hai solid propellant ki g**nd me aag aur शूईईई...
Again wrong about how QRSAM is supposed to be more mobile and keep up with infantry. QRSAM is mounted on truck and one variant of Akash is based on BMP-2; now you tell me, which's more mobile?
It's a simply a result of convergent evolution where Akash evolved into Akash NG and Astra into QRSAM and now we have this weird redundancy that makes absolutely no sense.