They had it, and trained it extensively in 2023...25. You can track big joint exercises between IRGC and IRIADF, they were specifically about that (as a reply to underperformance of the original system, where true IADS was developed only for the army, - and it couldn't stop even token Israeli attacks).The thing is Iran lacks a fully integrated IADS. They do not have modern fighter aircraft to cover gaps in SAM coverage. They don't have AEW&C aircraft, etc. And they lack China's satellite recon complexes.
IADS isn't that hard of a system nowadays if one is willing, relatively straighforward software and enough hardware.
At this point it seems that the very existence of IADS was part of their downfall - big integrated system was collapsed early on anyway, resistance-type IRGC was compromised by that very IADS (maybe directly through hacked spatial data) and failed to disperse.
Iran indeed has very difficult terrain and lots of old ADF SAMs - but well, so, until very recently, did even the PLAAF(HQ-2 didn't really go that long ago, and both Iran and China use relatively similar solution to that problem - HQ-22 is conceptually kinda similar to Khordad-15 ... and there are certain rumors that it's beyond concepts, as NORINCO is an integral part of iranian SAM development).
Big lessons of Iran (and, to a lesser degree, Russia) -
(1)beware of Greeks bearing gifts.
(2)wide availability of drones is threat.
(3)unsuppressed 5th column is a threat.
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