Abstract
Generative AI assistants typically embody a convergent "Coach" paradigm designed to resolve ambiguity. While effective for technical tasks, this risks premature convergence in creative domains, constraining output variance. To diagnose this, we conducted a qualitative study (N=9) where expert creatives interacted with a deliberately convergent AI "Coach." Findings reveal an interactional paradox: while the AI’s linear framework provides "ignition" utility by unblocking conceptualization, its strict linearity clashes with organic workflows. Furthermore, this structural convergence often induces "aesthetic sanitization," yielding generic outputs that limit individualized nuance. Rejecting subservient agreement, experts desire active collaborators capable of productive tension. We subsequently reframe output convergence as a "full-stack" design challenge, identifying prescriptive interfaces as an unmet opportunity for optimization. To empower authentic expression's "weird corners," we call for Generative frameworks operationalizing the Double Diamond, utilizing fluid role-shifting and contextual memory to balance additive improvisation with rigorous critique.