the whole point is that you give Iran the weapons systems it needs to control the Persian Gulf yet would be of limited use for threatening the UAE or Saudi Arabian homelands.
The Persian Gulf has geography that heavily favors short/medium ranged systems.
Immediately you notice the Straits of Hormuz are a major chokepoint for anyone that has a forward base only inside the Gulf, there's mountain ranges in Iran right up to the coast.
It is an environment with easy ISR of targets: shallow water, no cover or concealment on the southern bank, constricted movement in all 3 dimensions.
Neither UAE nor Saudi are severely threatened if Iran has an advantage in the Persian Gulf, since
and
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ISR: There can be potentially supply of data (to identify forces in the gulf), early warning radars or even radar bases, and in exchange local partners gives datasharing for those radars. These radars conduct early warning of fleet movements and missile launches in the entire western IOR. Again, Saudi and UAE shouldn't be threatened by this, as they're not going to be launching missiles or moving large fleets against Iran.