The scientific community is increasingly aware of the importance of reproducibility in research. As our understanding deepens, our knowledge of scientific findings may change, and what is considered valid today may not be in the future. Mapping the electronic phase diagram of superconducting materials helps identify the key ingredients that enable high-temperature superconductivity. These diagrams show how different degrees of freedom, such as spin, charge, orbital, and lattice, may compete or coexist. As experimental methods improve, these diagrams become more detailed and complex. An example is the discovery of charge order in copper oxide superconductors (cuprates), which was made possible by advances in resonant X-ray scattering. Charge density waves (CDWs) are electronic structures that can be commensurate or incommensurate with the crystal structure. Advanced techniques like resonant inelastic X-ray scattering helped identify CDW order in the parent compound of cuprates. Following the discovery of superconducting nickelates, scientists mapped their phase diagrams, finding similarities to cuprates but also differences. The parent nickelates showed a CDW, unlike the doped cuprates. However, recent studies suggest that the CDW in nickelates is not intrinsic but arises from impurity phases. Nickelates were long considered ideal for replicating cuprate superconductivity, but superconductivity was not observed until 2019. Recent research using molecular beam epitaxy showed that CDW is not present in single-phase samples, suggesting it arises from impurities. These findings highlight the importance of understanding complex materials. Similar advances have occurred in other fields, such as photophysics of halide perovskites and mRNA vaccine engineering. The study of superconducting materials' phase diagrams continues to reveal key insights into high-temperature superconductivity.The scientific community is increasingly aware of the importance of reproducibility in research. As our understanding deepens, our knowledge of scientific findings may change, and what is considered valid today may not be in the future. Mapping the electronic phase diagram of superconducting materials helps identify the key ingredients that enable high-temperature superconductivity. These diagrams show how different degrees of freedom, such as spin, charge, orbital, and lattice, may compete or coexist. As experimental methods improve, these diagrams become more detailed and complex. An example is the discovery of charge order in copper oxide superconductors (cuprates), which was made possible by advances in resonant X-ray scattering. Charge density waves (CDWs) are electronic structures that can be commensurate or incommensurate with the crystal structure. Advanced techniques like resonant inelastic X-ray scattering helped identify CDW order in the parent compound of cuprates. Following the discovery of superconducting nickelates, scientists mapped their phase diagrams, finding similarities to cuprates but also differences. The parent nickelates showed a CDW, unlike the doped cuprates. However, recent studies suggest that the CDW in nickelates is not intrinsic but arises from impurity phases. Nickelates were long considered ideal for replicating cuprate superconductivity, but superconductivity was not observed until 2019. Recent research using molecular beam epitaxy showed that CDW is not present in single-phase samples, suggesting it arises from impurities. These findings highlight the importance of understanding complex materials. Similar advances have occurred in other fields, such as photophysics of halide perovskites and mRNA vaccine engineering. The study of superconducting materials' phase diagrams continues to reveal key insights into high-temperature superconductivity.