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Current psychiatric models, while clinically valuable, remain limited in their ability to account for the complexity, variability, and context dependence of mental disorders. Converging evidence from neuroscience, complexity science, and psychedelic research suggests that psychiatric symptoms may be better understood as stable patterns of organization within dynamic, multilevel systems rather than as outputs of isolated biological dysfunction. This paper proposes a systems-based framework in which therapeutic change is conceptualized as a phased process of perturbation, reorganization, and consolidation. Within this model, interventions act by modulating system stability and plasticity, with outcomes determined by interactions among biological, psychological, relational, and environmental factors over time. Psychedelic-assisted therapies provide a particularly revealing case, as they reliably induce transient destabilization of entrenched patterns, increasing flexibility and enabling reorganization under supportive conditions. This formulation suggests a generalizable mechanism of healing across modalities: the strategic destabilization of rigid system states followed by the consolidation of more adaptive configurations. Accordingly, recovery is reframed not as symptom reduction alone, but as increased coherence, flexibility, and adaptive capacity across domains of functioning. This perspective has implications for assessment, ethics, clinical implementation, and research design, including the need for longitudinal, context-sensitive outcome measures and hybrid methodologies. A systems-based psychiatry does not replace mechanistic models but reorganizes them within a framework that accommodates emergence, temporal dynamics, and context, offering a foundation for more integrative and preventive approaches to mental health care.