Iran desperately needs to increase the range of its systems. Its hawk system dominates most of the air defense architecture. The S-200's are to old to be reliable in modern air defense, and domestic systems 3rd khordad is to short range but that's fair, I'm assuming it's meant to compliment larger systems sort of like Russian Tor. Talash 2 also too short in range with Sayyad 2 (Hopefully Sayyad 3 will change that). Iran needs tons of 200 km+ range to prevent the use of long range stand off weapons of bombers and cover its airspace like the S-200/300, increase area denial capacity, and stop or atleast mitigate a saturation strike of stand off weapons like cruise missiles for enough time and cover for massive saturation missile strikes on enemy airbases, anti-shipping and critical infrastructure (if the enemy is regional) and essentially end any war in a matter of days by knocking out enemy capacity to wage it. Also, increased range allows protection of naval ships in the Persian gulf, as Iranian airforce cannot be relied upon for protecting Iranian vessels and airspace in the Persian gulf, they are practically sitting ducks in there. I only hope the Bavar is capable of providing that support.