During Run 2 of the LHC, ATLAS performed a suite of searches for supersymmetry (SUSY) which produced null results and extensive limits on sparticle masses in simplified scenarios. However, many SUSY scenarios could have evaded detection through a richer phenomenology not captured by these simplified models. I will present the constraints from eight of the key searches for the electroweak production of supersymmetric particles, interpreted in the phenomenological MSSM. I will also discuss the complementarity of these searches to constraints from beyond ATLAS, such as limits from dark matter experiments. These results provide an overview of the electroweak SUSY landscape after the ATLAS Run 2 search programme and highlight places where SUSY could yet be hiding.