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Chipset has fixed bandwidth. OCS bandwidth was something great in 85, really good in 87, ok enough in 90 and rather limiting in 92. AGA bandwidth was fairly ok in 92 but spiraling down ever since. And most (S)VGA cards already had much more higher local mem bandwidth at the time. What they were lackign was fast enough interface between CPU and local mem (which was fixed with VLB and later on PCI). Hardware sprites were something really great up to 16bit platforms but with 32bit platforms it was easier to just calculate stuff with decent CPU (and fully programmable co-processor rather than quite limited copper and blitter alone).
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