"Important nuances" refers to subtle details or differences that are significant and have a key impact on understanding or interpreting something. Full definition
To add one more important nuance, blockchains can serve as a platform on which code can be executed and apps can be run. (lawpracticetoday.org)
Furthermore, by homogenizing the entire ocean into a single metric, they miss important nuances of local and regional scale redox changes that might reflect the activity of climatic feedback processes, such as weathering, ocean circulation change, or temperature change. (royalsociety.org)