Why rotoscope with splines instead of painting?

I’ve been wondering, why go through the painful process of rotoscoping with splines? You have to check so many points and if there is a semi-transparent area it’s getting even more tedious.

Why not just open the image sequence in Photoshop and paint the mask in, frame by frame? You can copy the old mask and change the areas that have changed, so you save time. Semi-transparent areas are also easier to paint then to match with splines… or maybe I’m wrong here.

Or is there an important point in using splines that I’ve missed?

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