As much as Saint Tusa wanted to have it all, it was impossible for his Dark Zephyr to excel in every area.
The closest the living mech could come to performing like a mythical omnimech was the distinctly boring Multipurpose Edition.
Compared to a theoretical omnimech that possessed all of the advantages of every mech archetype with none of the associated weaknesses, the Multipurpose Edition was too lacking in hard power!
Tusa hated the indecisive nature of a multipurpose mech. Every machine that carried 20 different miniaturized modules could seemingly do everything, but never managed to excel in anything.
This was why he rejected the Multipurpose Edition despite how tempting it sounded to possess very little weaknesses. He believed he could do more for his clan if he became overwhelmingly strong in a single function.