I'm not seeing the "needless complexity" in this. The only thing that could possibly lead to confusion in the matter, as far as I can tell, is that they accidentally left out the word "OR" on the SOEP prerequisites list.
Just relax. Use one method. Or use the other one. So they spent a paragraph explaining an "alternative" method of entering a SOEP. Personally i think it makes the system a bit more robust.
And it allows for better "story sense" to have prerequisites available as an option. Your character is going to pick up cetain skill during his career. Those skill will make it easier if he decides it is time for a "career change" at some point.
Frankly, the idea of taking the Innovative edge to then purchase Starship Duty in an attempt to circumvent the prerequisites is too strongly a metagame action to be allowed unless there is an extraordinary story explanation.