At any given moment there are several leading (and hundreds of secondary) Rabbis and Poskim. Each one running his own Yeshivah, writing his books and issuing his own Psakim.
I understood that the very idea of the Sanhedrin(s) was exactly the opposite of that - to achieve universality and acceptability of the Psakim, coming out of a Beis Din and not from single Poskim.
I also recognize, that this pattern emerged already from the time of the Tannoyim when the Sanhedrin still theoretically existed - each Rabbi had his own school instead of teaming up and working together.
What theological or Hashkafic explanation might fit this phenomenon - what the Rabbis themselves think about it and how does Judaism benefit from it?