If they are making them for themselves a truck is easier and cheaper to produce that what is essentially a light tank vehicle, and cheaper and easier to operate... for instance a tank after 10,000km road travel would probably need about two services and an overhaul, but a truck could probably do four or five times that distance before needing work at the very least.
The radar and electronics are very modern and very capable and not cheap or simple... but make it a very effective and capable system... that will be the production problem, but licence production should solve those problems and keep the quality high.
The missiles are relatively cheap and simple with command guidance and no expensive radar or IR seeker in each missile so you can make the missiles in enormous numbers.
It is expensive and complex where it needs to be to make it very effective... this system can shoot down Hellfire missiles and HARM missiles and Iron bombs and guided bombs and drones and artillery shells and artillery rockets.
In this case the chassis is cheap and mobile, but the original was intended to operate with armour so tracks were needed and useful and worth the extra cost.
It was expensive where it needed to be and cheap everywhere else so it could be used.
This is not a system like Javelin where the missiles are more expensive than a house so it might appear on paper as being effective, but you wont have too many missiles so you better make them count.
This system is not cheap but very effective and it is cheap to actually use... so there is no fear in using it on cheap drones... though an even smaller and lighter missile is being developed for use against very light targets that don't need heavy HE warheads to destroy.
India has all sorts of joint ventures, but in my opinion making your own tanks and fighter aircraft is inefficient.... when you only make 3-400 planes or 1,000 odd tanks it is hardly worth setting up production... and what else can you make there?
Making your own low level SAMs makes sense because you want them to be made in enormous volumes... both the systems and the missiles themselves because anti aircraft missiles are like anti tank missiles... even very ordinary models become effective when used in enormous numbers and India is currently producing Igla-S, which I seem to remember Iran is making as well. If they both added TOR on trucks... local made trucks... then that would be of enormous benefit because such missiles are excellent for defending all sorts of targets.
Having only big heavy long range missiles makes you vulnerable because they are expensive because of their size so there is a limit to how many you can buy, but smaller missiles distributed all over the battlefield can be even more devastating because the service ceiling is about 15km and they can operate in optical mode when being sneaky and can receive target information from other vehicles so the vehicle that launches a missile at you might be 2km behind you as you line up a TOR vehicle with its radar going 20km in front of you so you think you are safe and you get a surprise delivery...