On Succos we celebrate starting the second night Simchas Bais HaShoaiva. According to the Chachamim we can not start on the first night as we use musical instruments and it is not Doche Shabbos or Yom Tov. However in the Gemara Succa 50b Reb Yossi holds it is Doche Shabbos and Yom Tov. Then why according to Reb Yossi do we not start Simchas Bais HaShoaiva on the first night?
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Maybe because that's how it was done in the Beis Hamikdash? Since SBHS there involved musical instruments, it couldn't take place on Shabbos or Yom Tov (Sukkah 50a-b).
That said, there are communities in which they have SBHS on all nights of Sukkos - with or without music, as the case may be.
For the revised question:
Short answer is that Simhat Beit HaShoeiva as we have it today was a custom primarily starte by the RaShaSh in Yeshivat HaMekubalim Beit El(sources in the Divrei Shalom and Hida to be forthcoming IY"H). So the way in which we do it now, essentially reflects the way the mekubalim of Beit El (re)established the custom.