Because constitutive theories for amorphous materials lack a physical foundation, they frequently have limited ability to simulate complex behavior involving a broad range of conditions. This constraint must be addressed for complicated phenomena like temperature- and composition-driven glass transition, Mullin's effect, pure-brittle damage, post-fracture out-of-plane structures, etc. Microscopically, these materials lack long-range order, and their macroscopic response, though robust, is the result of several different mesomechanisms that are distributed over many timescales and lengthscales and must be taken into consideration. This talk will cover a few unified viscoelastic theories and damage models, focusing on how they apply to the previously listed phenomena. For future investigations on phenomena such as stimulus-driven shape recovery, friction-based damage in geological processes, self-healing in geomaterials, etc., these models might act as foundational theories.