Singha, you are missing the point.
Of course, the RPG is short ranged, its a RPG, the name says it all.
the specs of the RPG30 make it completely useless against frontal aspect of even T72upg and its range only 200m. it is a RPG not a ATGM which is heavy enough as it is, without having to lug a precursor round.
It has 600 mm penetration post ERA. I suspect it can take out many western tanks when hitting at the right spot - drivers hatch for instance!
For longer ranges you need missiles.
I posted two quick examples of how APS are being countered - 1) By Infantry Portable Weapons (i.e. Missiles) and 2) By Infantry weapons (eg RPGs).
The point is when deployed in large numbers (where infantry deployed weapons always score over tanks), in different conditions, APS systems can be overwhelmed and saturated. At most you made it more difficult than 1 ATGM per tank.
Here is an example. Tank with APS advancing in urban terrain - buildings etc, overlooking a tank column. Troops are behind the tank, because in the close confines of the street, the APS is dangerous to them.
Insurgents pop out of windows and fire some 3-4 RPGs and other rounds at the lead tank at the same area - can the tank APS take down every round in that sector? Especially if the RPGs themselves are advanced units with decoy rounds.
APS is useful, and its initial deployment can be game changing (same as SAMs in Vietnam then Yom Kippur) but countermeasures are fast advancing.
APS depends on radar guidance for instance. What prevents weapons manufacturers from launching chaff & flare payloads (you have an example in the DRDO thread about an anti-thermal, anti-laser) to blind the tanks sensors and then launch a salvo of ATGMs.
Same concept is there everywhere. Blind the sensors (even if momentarily), launch saturation attack. Its an age-old tactic which is deployed even today.
Even against S-3XX class systems, you will have the Khan deploy a wide array of jamming (of all kinds), launch decoys (max out the missiles) and then sneak in actual weapons in between.
With the relatively lower cost of ATGMs, they will be deployed en masse.
This does not mean we should not procure APS - just means it wont be a single shot silver bullet & heavy passive/active armor should still be used.