Appearance are the most powerful feature of Illustrator, but the learning curve is difficult and for Advanced User it's difficult to manage and remember what are doing what in a Complex Appearance (cf. Screenshot where I had to use Colors to identify properties…)

Adding features like:
– Renaming (fill, stroke and effects)
– Folders (like in Ps: "Pass Trough" blend mode, knockout, vector mask based on "Convert to shape" with 9 points proxy…)

It will be more easier to understand Complex Appearance samples and for Advanced users, it will be way more efficient.