  It is sometimes argued that a virtue of pushing the supersymmetry breaking
scale above 1 PeV is that no particular flavor structure is required in the
soft sector in order to evade bounds on flavor-changing neutral currents.
However, without flavor structure, suppressing generic Planck-suppressed
contributions to proton decay requires even higher SUSY scales, of order
$10^{11}$ ($10^9$) GeV for degenerate (mini-split) gauginos and scalars. With
flavor structure, the question of whether proton decay or flavor symmetries are
more constraining is model-dependent, but it straightforward to find simple
models where both constraints are satisfied for much lower SUSY scales.
