For me, cutout animation is a must in an engine : it doesn’t require a lot of power, and save a good amount of memory, that’s why Spine models are efficient and compact. But Spine models requires a software, which are often non-free.
That’s why I wanna discuss about adding a custom animation resource & component in Defold, to be able to make custom animations. Plus, they might be used in other ways (non visual applications), for example, controlling the gravity of a player while jumping to have more control over the jump curve (more hang up time, faster fall, …). This can be done very easily with a curve/animation.