In the Gemmorah we can see three types of the Halachic resolution of a dispute:
- the issue is settled and the Halachah is clearly ruled
- multiple approaches mentioned but there's no clear resolution
- two approaches are mentioned and the Gemmorah announces Tekku (no way of resolution)
The following Poskim (Geonim, Rishonim inc. Rambam, Abchronim) had to choose either side in those disputes (#2 and #3) to Pasken the Halachah.
Why didn't the editors of the Gemmorah Pasken all the disputes themselves, and left so many disputes unresolved?