No Bracha on Sleeping in the Sukkah

Chaim B. writes about why we don't make a bracha on sleeping in the sukkah here, here, here, and here. I guess he likes this topic a lot. In one of the posts Mike S. makes the following comment regarding the other bracha made on sleeping, Birchas Hamapil:

By the way, although I don't know the reason for it, R. Y. Halberstam, in reporting a discussion between one of his daughters and a teacher, once told me that in Chassidic families the custom is not to say birchat Hamapil.

I actually saw a short paragraph on this issue on page 153 of the Sefer Nefesh HaRav by R' Hershel Schachter. I will paraphrase into English:

Birchas Hamapil: Even though this bracha is mentioned in the Gemara in Brachos 60b, many do not have the custom to say it. We have to understand - what changed now from the times of the gemara that nowadays we no longer need to say it? It seems that what changed is that in the times of the Savoraim (after the zman hagemara) the minhag became to say Baruch Hashem Liolam Amen V'Amen, in which we say the phrase Byadcha Afkid Ruchi and other pesukim of emunah, and all the ideas that are included in Hamapil we already said in the pesukim of Baruch Hashem L'Olam, and therefore it is possible to say that it is no longer applicable the Takanah of saying Birchas Hamapil.