  The stability of the electroweak scale, challenged by the absence of
deviations in flavor physics, prompts the consideration of SMEFT scenarios
governed by approximate SM flavor symmetries. This study examines microscopic
theories that match onto a set of $U(3)^5$-symmetric dimension-6 operators.
Renormalization group mixing from the ultraviolet to the electroweak scale
yields significant phenomenological constraints, particularly pronounced for
UV-motivated directions. To demonstrate this, we explore a complete suite of
tree-level models featuring new spin-0, 1/2, and 1 fields, categorized by their
irreducible representations under the flavor group. We find that for the
leading directions, corresponding to a single-mediator dominance, RG mixing
effects occasionally serve as the primary indirect probe.
