  Recent developments in theoretical modeling and in computational power have
allowed us to make significant progress on a goal not achieved yet in nuclear
theory: a fully microscopic theory of nuclear fission. The complete microscopic
description remains a computationally demanding task, but the information that
can be provided by current calculations can be extremely useful to guide and
constrain phenomenological approaches. First, a truly microscopic framework
that can describe the real-time dynamics of the fissioning system can justify
or rule out assumptions and approximations incompatible with an accurate
quantum treatment or with our understanding of the inter nucleon interactions.
Second, the microscopic approach can be used to obtain trends such as: the
excitation energy sharing mechanism between fission fragments (FFs) with
increasing excitation energy of the fissioning system, the angular momentum
content of the FFs, or even to compute observables that cannot be otherwise
calculated in phenomenological approaches or even measured, as in the case of
astronomical environments. Merely the characterization of the trends would be
of great importance for various application. We present here arguments that a
truly microscopic approach to fission does not support the assumption of
adiabaticity of the large amplitude collective motion in fission, particularly
starting from the outer saddle down to the scission configuration.
