So far all of those "missile stockpile estimates" were proven to be all wrong
These systems are meant for laying low waiting to ambush only. They are the safest bet for air defence since they don't emit radar signals to attract a bunch of drones and stand off munitions. Another good thing about this kind of IRST/EO system is they can work independently and not relying on a single radar like S-300/400. If one radar of the S-300 is hit, the rest of the launchers can't do anything further. In order to make these passive systems more effective, you would need thousands of them; for instance you would place 5-10 of them at or near 100-200 locations of high-valued targets that you expect fighter jets will hit those areas. Once very good system out there is the Russian Sosna-R that can hit at 10 km distant and 5 km altitude and I have seen this system on a 2x2 vehicle.
Sulphur flatus.... that's good
