@Michael V. Parent
Don't forget AGA Amigas could make use of extra ram and cpu... if copper/blitter isn't enough it's possible to use raw cpu power to add any missing sprite/parallax you need, and cpu can also modify colour registers faster.
For OCS/ECS I can understand to limit the games to 1MB chip but for AGA using a 030/25 and 8MB of fastram would be the absolute minimum IMHO. After all Amiga 4000 was sold with 030/25 and 8MB as default in some configurations and 030s are very common.
With an accelerator it should be easier to create quarter-pixel scrolls for example. And also to modify more colours on each scanline... you could still use hardware scroll but when there are too many objects on screen the gfx composition could be performed by the cpu in fastram (directly in planar mode, skipping c2p)
