Work Flow Analysis is quite important because we learned that most flows are in the heads of just a few. Our job is to build a document which covers as much as possible of that undocumented know-how. This also includes intensive interviews with all participants. Feasibility Study builds a basis for decision.
Computers seem to make everything possible.
Still, this is not the case. Man's desire for change sometimes wants to apply changes where anything is already working perfectly. Such things also change if managers come and go. We figure it out. Project Description goes along with Documentation since it is the begin of the project's lifetime documentation.