Stellar atmosphere models are a fundamental tool in modern astrophysics with their typical applications ranging from analysing particular observations to predicting the appearance of unresolved stellar populations. With the inclusion of hydrodynamics, a new generation of atmospheres is emerging, which allows to consistently quantify the feedback from a given set of stellar parameters. The talk will provide an overview of the techniques and challenges of modern stellar atmospheres as well as outline the underlying ideas of next-generation models. Focusing on the yet poorly understood winds of H-depleted stars, I will show recent results indicating a substantial shift in our understanding of radiation-driven winds. With major consequences on e.g. maximum black hole masses or He II ionising fluxes, next-generation atmospheres likely will have a large-scale impact for various fields of astrophysics.