The issue wasn't a lack of planning by the military it was a lack of commitment on the goals by the administration. If it was just a desert storm style campaign (hit them very hard over a month then leave without finishing off Saddam) then they should have left already when Iran offered to open the strait, and it could have been sold as a success.

If they want Iran to truely bend the knee over nukes then they have to commit harder militarily than they are now, which neither the president nor the public seems to have an appetite for and Iran knows that. So now it's mostly deadlocked on both the US demanding Iran lose face by giving up Uranium immediately, while Israel wants to keep up an air campaign to further neuter Irans combat capabilities to free up their own strategic goals against Hezbollah and Hamas. But neither options are properly aligned, especially with fanatics in IRGC taking over.

It's either a short air campaign or a war, but they can't seem to decide so we are left with an blockade.