Halachipedia writes that
Outside Israel, on the eighth day of Sukkot (first day of Shemini Atseret), one should eat in the Sukkah without a Bracha of Leshev BaSukkah.
The source for this is quoted as Rambam (Sukkah 6:13), Tur and S”A 668:1.
The question is what should someone who lives outside Israel do on Shemini Atseret if he is eating with a family who live in Israel and who therefore eat in the house.
A Jew from outside Israel who is visiting Israel for Sukkot should not eat in the Sukkah if it’s difficult to sit alone in the Sukkah.
and quotes Nitai Gavriel (Hilchot Arbah Minim Sh”t 8), Sh”t Minchat Yitzchak 9:54, Rabbi Shlomo Zalman Auerbach in Sh”t Minchat Shlomo 1:19, Rabbi Ovadyah Yosef in Chazon Ovadyah Sukkot(pg 480-1), Ot Hei LeOlam (vol 2 pg 87c; quoted by Sdei Chemed Sukkah 1) as sources.
Chazon Ovadyah Sukkot (pg 480-1) writes explicitly that if it’s not difficult to eat in the Sukkah such as one is staying by himself then he should sit in the Sukkah. However, Sh”t Minchat Shlomo 1:19 exempts such a person in all circumstances. So writes the Piskei Teshuvot 668:2 in name of Sh”t Minchat Yitzchak and Sh”t Minchat Shlomo.
What practical rulings have been heard on this subject?