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compositing has nothing to do with 3d acceleration.

NeXT slabs and cubes did have a low-function blitter used to composite the main display.

Edit: this was the Turbo units, which did have a bus-assisted block copy.

Before that, just well-tuned 68030 burst block copy - they rendered to backing store and did block copies with a special case of vram to vram block copies (used for window compositing).

In this direct context, I absolutely think it does and it's integral to the definition.

What do you understand by "display compositing" that doesn't involve 3D hardware?

What the hell does 3D hardware have to do with the block copies compositing window managers like MacOS are doing?

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