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I would guess combining pieces of two images is a simple place where the graph could become non linear. Agree that if that is the case they should indicate it in their gifs tho

A node system can do everything a linear system can but also branch or send the same asset down multiple flows and back again without the linear workflow crutches for that (“smart objects”/“symbols”).

Ive been wanting someone to tackle this on the 2D side for a decade now.

It’s not a 2D workflow. Editing involves branching.

It’s usual to apply treatment to the image then merge it back using a special kind of merge for exemple to isolate a colour channel or to do things on the desaturated image to work on lighting.