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Anti blooming prevents charge spilling over into adjacent pixels by bleeding off the excess charge, but it doesn’t change that a pixel at its maximum value is always going to look saturated (because it is). Loss of star colour is exactly because of this, regardless of chip design. Balancing exposure time is crucial for optimal results.
Of course, this is exacerbated when we start compressing a 16-bit image into something we can actually display...most computer displays are only 8-bit (although 10-bit displays are available, at a price) and our venerable jpeg is (unsurprisingly) only 8-bit also.
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