It was changed to prevent stalling and winning by cheap single leg takedowns and to encourage throws. One thing I hated was they even banned the Kata Guruma (Firemans carry in wrestling) from competition. It was my go to move and the use of the gi always helped me get a good elbow tie grip to set up the throw.
Freestyle wrestling complemented it well because throws are encouraged for higher scores. The rules have changed a lot in freestyle wrestling also, I think a high scoring throw now counts as the match being over, similar to Judo