Glad you are here, @greenrun. It's true that sometimes the copy is better than the original, but many do not add those changes based on the limitation(s) of the original innovator I gave example about. The originator benefits nothing from what is supposed to be his brainchild.
Okay since Steve Jobs says "great artists steals, then stealing is justified. Well...that is his opinion. Thanks for your contribution.
[Edited...]
I think the steal he means is just to be inspired by ideas of others. It's hard to see a technology that is not inspired by other technology. Even some apps are a "copy" of ideas of other apps. Eg, Messageme, copied some Asian apps.