The straight is narrow enough that they could use artillery to hit the ships in it.

And for US and/or Israel to prevent it, they would have to occupy the correspondingly wide strip of Iranian coast. At which point we're talking about a massive ground invasion (and of course then the same artillery would be firing at those troops, so you can't really just stop there either).

Or, you know, counter-battery systems and hundreds of patrolling drones.

During Desert Storm, US batteries returned fire before enemy rounds even hit apogee.