I wanted to share this email I got from Stern support today regarding the need for the "Capacitor Service Kit 502-7059-00" for Shaker kit installations. I think this helps us understand what has changed...
"The capacitor service kit is not need on all newer stern game. The capacitors are incorporated into the cabinet node board and should be able to connect the shaker motor direct to the cabinet NODE boards CN16 and not have to use the shaker motor Capacitor harness."
Hope this helps others to eliminate some shaker kit installation confusion.