The fix was initially made to fix a crash. Spawning with a non-ridable mount caused a crash in the AI side. Initial discussions we had was that we were going to reduce the riding requirements of some horses. But in the end we decided to fix the crash itself and revert the non-ridable change, so that players could at least ride the pack camel, since it's not easy to find normal ridable camels.
After that discussion other things took priority but I'm chasing down this issue internally. Sorry for the delay.