First off, if I gave the impression that coordination does not exist, I didn't mean to. But as with anything else, things can always be done better. As for the hypothetical, to fully explain would put me discussing things in too much detail for a public message board, because I'd be straying from my opinion.
I'm not going to be foolish enough to cite examples of actual plans other than to say, pick one. Might want to start somewhere around 1788 or so.
Leadership is always an issue, but leadership also extends beyond the oval office. I know your take on things, I think you know mine - unless you really think me a neo-con Bush appologist. The truth is, I think traditionally, every administration finds a way to put constraints on the creation of policy - they should, as policy is their lane. It's the functional mechanics I'd like to see get organized differently.
You keep sneaking thinly veiled Bush shots in there, so be it. Whatever. 9/11 or not, the function of government at the national strategic and policy level is a pretty complicated beast. The simplest thing can become tremendously complicated just in deconflicting policy and strategy directives, even terminology within a single agency, let alone cross agency. It's hard to get those complications across to most people. It's not anyone's "fault", it's friggen US Government.