  Understanding properties of Quark-Gluon Plasma requires an unbiased
comparison of experimental data with theoretical predictions. To that end, we
developed the dynamical energy loss formalism which, in distinction to most
other methods, takes into account a realistic medium composed of dynamical
scattering centers. The formalism also allows making numerical predictions for
a wide number of observables with the same parameter set fixed to standard
literature values. In this proceedings, we overview our recently developed
DREENA-C and DREENA-B frameworks, where DREENA is a computational
implementation of the dynamical energy loss formalism, and where C stands for
constant temperature QCD medium, while B stands for the medium modeled by 1+1D
Bjorken expansion. At constant temperature our predictions overestimate $v_2$,
in contrast to other models, but consistent with simple analytical estimates.
With Bjorken expansion, we have a good agreement of the predictions with both
$R_{AA}$ and $v_2$ measurements. We find that introducing medium evolution has
a larger effect on $v_2$ predictions, but for precision predictions it has to
be taken into account in $R_{AA}$ predictions as well. Based on numerical
calculations and simple analytical derivations, we also propose a new
observable, which we call path length sensitive suppression ratio, for which we
argue that the path length dependence can be assessed in a straightforward
manner. We also argue that $Pb+Pb$ vs. $Xe+Xe$ measurements make a good system
to assess the path length dependence. As an outlook, we expect that
introduction of more complex medium evolution (beyond Bjorken expansion) in the
dynamical energy loss formalism can provide a basis for a state of the art QGP
tomography tool - e.g. to jointly constrain the medium properties from the
point of both high pt and low pt data.
