I can't select two effects, applied to different fills in one appearance — AI restricts to select both of them. Therefore, if I have same effect applied to all of my object's fills, I have to edit EACH of them one by one, instead of just Ctrl+click all of them and edit at once.
It means that if I want to change Drop shadow's parameters, scattered across different appearances, no graphic style won't help me. And I already mentioned in separate enquiry that Drop shadow and other color-based effects ignore global swatches.
This is nuts. I waste so much time.

A related entry:
Can't edit simultaneously two several selected fills in Appearance
http://illustrator.uservoice.com/forums/333657/suggestions/35333755