If palladium isn't released as much then the toxicity of it might not be as much of an issue. The saying might apply that "the dose makes the poison" with palladium.
"Research suggests that palladium seems to be
necessary in gold alloys in order to prevent corrosion of base
metals. This is confirmed by the relatively low ion release
from palladium and silver/palladium based alloys. Generally it
is found that copper, zinc and indium ions are passing into