N0m:
As much as I don’t want to really get involved here, do you have any evidence at all that eating before davening was regional? I’ve never heard of anyone other than Chabad claiming that it’s ok. By the way, the Baal HaTanya was not matir. It’s a later Chabad minhag.
Not sleeping in the sukkah is not in-and-of itself controversial. It’s Chabad’s insistence that they are “machmir” to not sleep in the sukkah. As you know from the other thread, it bothers me when people are too insecure to just admit the fact that they’re relying on kulos.
“The Shulchan Aruch says that one sits in the sukkah on Shmini Atzeres.”
Nobody can call it a chiyuv. To get around stira and bal tosef, poskim are forced to say you just eat in the Sukkah because it’s nice, not because it’s a mitzvah. It might have been minhag klal yisroel, but if it’s not a chiyuv what’s the big deal with Chassidim not doing it?