  It is of interest to understand whether or not one can construct a classical
field theory description of early cosmology which would be free of the initial
singularity and stable throughout the whole evolution. One of the known
possibilities is genesis within the Horndeski theory, which is thought to be an
alternative to or a possible completion of the inflationary scenario. In this
model, the strong coupling energy scale tends to zero in the asymptotic past,
$t \to - \infty$, making the model potentially intractable. We point out that
despite the latter property, the classical setup may be trustworthy since the
energy scale of the classical evolution (the inverse of its timescale) also
vanishes as $t \to -\infty$. In the framework of a concrete model belonging to
the Horndeski class, we show that the strong coupling energy scale of the cubic
interactions vastly exceeds the classical energy scale in a certain range of
parameters, indicating that the classical description is possible.
