Further discussion of the error threshold is given in the Supporting Information, which shows the 1.1 eV SA-CASSCF error threshold to be optimal (albeit imperfect) for isolating subsets of automated wave function calculations that reproduce results curated by hand. Additionally, we analyze alternative error thresholds on the NEVPT2 and tPBE0 error. However, an error criterion cannot be used when a benchmark excitation energy or experimental excitation energy is not available. Nevertheless, when an accurate value is not available, one can still use this criterion (although with somewhat less reliably) by comparing to one's best estimate rather than to an accurate value. Clearly, if one's best estimate is good, this will work as well as comparing to an accurate value.