Regarding Mik5, and the Chabad minhagim:
The Alter Rebbe holds that birchos hashachar are said on the concept of what they refer to, not on my having experienced that benefit. To illustrate; I say Hamaavir Shaina, to thank Hashem for waking me up generally every day, not that I was asleep last night and He woke me up today.
Therefore Minhag Chabad is to say these brochos whether or not they apply to me today. I have heard Rabonim rely on this psak in case of doubt.
Lubavitchers eat in the sukkah in the rain but don’t sleep in the sukkah. I believe this was the hanhogoh of the Rebbes (which as Chassidim will be relied on), but if anyone knows differently please let me know.