If we have a mixin of 6, with two inputs.
We immediately have a total of 6 * 2 = 12 decoys
Would it not be secure enough to have the 4 decoys with the two inputs which means two key images? So we have a ring size of 6 in total?
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Mixin 6 means a ring size of 7.
Having 2 real inputs and 5 decoys for an overall ring size of 7 is a lower level of privacy than the current implementation, which would be 2 real inputs and 12 decoys as part of two rings of size 7.
It would be worse if you were spending 6 inputs. You'd have only 1 decoy, so your privacy level would drop enormously.
Providing a consistent level of privacy no matter how many inputs are being spent is therefore an important design goal.