Isn't wealth redistribution via taxes treating the symptom and not the cause? We should look at the structures that allow massive wealth inequality to form in the first place. This could be a lot of things besides tax policy.
This would seem to lead to a Harrison Bergeron sort of outcome, no? I mean, basic variation in genetic factors, geographic and political circumstances of your birthplace, these things directly lead to variation of productivity, which in turn leads to variation of wealth.