| One of the key avenues towards cosmological discovery in the near future lies in statistics based on galaxies and clusters identified in imaging surveys, and their weak gravitational lensing effect. I will report on the leading cosmological constraints derived from DES first-year data that use different, lensing-empowered views of the matter density field. The limiting factor of these studies is the simplified model for the non-linear and astrophysical evolution of structure on the galaxy to cluster scale that we are currently able to apply. I will outline how more advanced modeling, joint probes, and well-designed complementary imaging and spectroscopic surveys are thus key to delivering on the promise of DES and LSST. |