I'm not surprised at all. Prosecutors love it. In at least one state, their high court upheld it on the basis it gives the prosecutors more options for plea bargains, which in itself, proves how unjust it is. As if giving prosecutors more leverage over people is in the interest of justice. What could go wrong? I mean we totally should want actual guilty people to plea down to lesser sentences and actually innocent people subjected to trial where they face even more severe sentences. Yet this is precisely how our injustice system intends to operate.
And let's not forget how the one of the main principles of a real justice system, mens rea, doesn't exist at all with felony murder. Completely absent. Which is why there have been instances in which the actual perpetrator of a killing got less time in a manslaughter plea while someone only tangentially related got life without parole for felony murder. I'd love to hear an argument for that being just.