occam's razor would suggest that the war planners were simply shortsighted here and thought that a regime change would occur quickly however, if we suspend this belief for a moment, it seems very likely they would have: 1) known about the asymmetric drone capabilities of the Iranians and how current very limited/expensive interceptor technology was inadequate to deal with this, especially in such volume- resulting directly in significant destruction of US and allied assets across the region and 2) realized that Iran could in fact keep the Strait of Hormuz closed for some period of time, cutting of the world from a vital energy source so who benefits in such a situation and why?