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My opinion...as long as animations have been created frame by frame through edits at the pixel level...it's all good. I don't have an issue with using something like Spriter Pro either, in the right hands masterpieces can be made in animating software like that.

I agree as long as the method is true the tool should be irrelevant, pixel art gets a good bit of its reverent position from being such a painstaking style. I'm a cheapo so I use gimp myself. The more access the better

Painstaking is legit.
I laugh when people say things like pixel art is easy....
No friend, your pixel art is just bad...lol

Lolz yeah I hear that a lot!