> The IRGC and Basij effectively do not have a chain of command and are effectively moving and acting by momentum

This was by design via the mosaic defense tactic.

They know the US prides itself on decapitation strikes, "taking out the leader of x" was a monthly headline during our time in Iraq, Afghanistan, and during the events of ISIS/syrian civil war. It's how the special forces operated, taking out a "leader", collecting all the names they could find in their possession, and taking those guys out. In the later days of Afghanistan, they stopped even trying to find out who the names were. If you were some mid-level Taliban member's dentist, you'd be fair game.

So Iran built a defense for that, a military that does not need a central command to continue fighting. They have their orders and they'll continue to carry them out. Completely bypass the benefits of highly accurate munitions, cyber intelligence, etc.

That's the same reason the first round of the Millennium challenge won outright. The red-team leadership knew to not expect last year's war today, and used their brains to exploit the weaknesses of a highly mechanized and sophisticated military.