Stage-III dark energy experiments have made incredible strides in the study of dark energy. Thanks to advances such as establishing the so-called 3x2pt technique, these experiments have opened new questions in the current cosmological paradigm. With its incredible statistical power, Rubin’s LSST will further take advantage of these techniques, but the importance of previously undetectable systematic effects will increase. In this talk we will present the preparations that DESC is making towards year 1 analyses and beyond, the challenges that Rubin and other experiments will face for their 3x2pt analyses, and how the combination of Stage IV data will help to solve some of these challenges.
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