Then what is this update change in game health and balance? Nothing, till last old shiny doesn't become history.
Do you know chance for encounter pokemon with 28+ IV's without shiny trigger? it's 4^6/31(32)^6 = 0,0000046(0,00046%) instead of old shinys - 0,00012(0,012%) and 0,00049(0,049%) with...