Mitzvos based on historical precedent (such as Sukkah) don’t make sense for the Avos to have kept. Lulav, on the other hand, there is no reason to think that they didn’t. The Midrash tells us that the Avos kept all of the Mitzvos (D’Oraisos or D’rabannans, depending on your Girsa). Obviously Avraham didn’t have a Bris until Hashem told him to. Thus, there are exceptions where it’s clear from Chumash that the Avos couldn’t have kept it. (Shabbos, for example, they probably didn’t keep because Hashem told B’nei Yisrael in the Midbar that it was an Os between Him and them; thus it probably wasn’t kept before then.) Sukkos, which is L’ma’an Yeid’u Doroseichem about the Midbar doesn’t make sense for them to have kept. They obviously weren’t Mekayim appointing a Melech or building a Beis Hamikdash either, etc.
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