It seems to have been ignored, but I’ll reiterate; the miteler rebbe and tons of other gedolim did not sleep in a sukkah in Europe because it was cold. Very cold. Mitztayer patur min hasukah-type cold. The last rebbe was bothered by why he did not sleep in the sukkah yet was very makpid on achila and shtiah. He gave a non-halachik answer, which he then applied to cases such as eretz yisroel, of which no one ever before or after has posited. Poof! We delete a mitzvah deoraysoh.
The fact that rav chaim volozhiner and others didn’t speak about what he did is misleading on two fronts. One, why would we assume that rav chaim had to address every single concern he had with chasidim? He expressed his opposition on the major issues very clearly in nefesh hachaim. The fact that he didn’t mention something is as much of a proof that he agrees to it as one who sees a rov walking in the street and passes by a hot dog stand; he doesn’t scream out “treif!” so we can assume he holds it’s kosher.
On the 2nd front, as i keep saying….he had a normal, by the books heter tbat virtually everyone used – He. Was. Cold.
Every single community in EY slept in a sukkah ka’halacha.