You know what? I think that it's still the best way to do massive bosses for games of that era.
When 16-bits remakes added a background the screen became less easy to read and stuff got cluttered too easily.
Limitations can sometimes be beneficial.
This is also why I'll always prefer the pitch black void on the Genesis version of 3D Blast's final boss than the Saturn's:
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Here in the Willy Wars it looks a bit ugly in the yellow background sadly:
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Almost as if the boss was smaller than its 8-bits counterpart.