The Material's Library on Fusion 360 is like a Kindergarten of materials. It is nice, is helps in extreme situations, but needs to go to school and to the university to be considered "professional".
In a normal work, the user makes a model, and want to put a specific material and a color to show the clients. This specific material couldn't be for God's shake "Plastis-Opaque-Blue"...It need to be for example a PLA, or a PET or whatever plastic exist in the wolrd. Only then, is a good design, taking in consideration the details as wich material should be ok or not in the manufacturing process.
Please, consider to give to the Material's Library and extremly usefull improvement as this or the next release.
Thanks!