A'ight, now that I finished the Dice-Killing arc on the sound novel, I'm now very confident in saying that yes, Shitsugou is supposed to be an alternate world, the one where Rika didn't ever get hit by Truck-kun and learn about Hanyuu's sin of abusing her god powers to let Rika live, and that she finally got some motherly, mature advice about making her own choices, and learning about how even someone who has sinned can still move on and live life to the fullest. It was the marketing's fault for tricking the audience into thinking Gou was going to be a complete reboot when it should've been open from the start that it's a sequel, albeit not necessarily that of Rei.
See, Bernkastel is a selfish witch, one who imposes others to make decisions for her. Satoko's backlash could totally be a result of Bernkastel's choices in not letting her be independent. Unfortunately, the execution is complete shit, and ruins an otherwise-decent idea for a Higurashi plot. Seems like not even the manga has been able to fix that despite how it deviates from the anime.
Even realizing that still gets me pissed off at how bad Ryukishi and Passione bungled Shitsugou. Goddamn.