Because it's how the system is meant to work. Define the problem, collect information, analyse, determine the best way forward, implement, check, repeat.
If you buy shit, or even really sexy Gucci gear, without a plan built on an underlying strategy, you end up with the wrong stuff. You waste time, money and degrade capability.
You end up having to cut, delay, cancel, replace early, .... Sound familiar?
There hasn't been a clear coherent plan carried to fruition (for the most part) since the late 80s.