Should Riot have waited to declare Worlds on Patch 5.19?

Looking over the 5.19 Patch Notes, I realized that a lot of the patch is just updates to bugs that existed in 5.18. With worlds being played on 5.18, it will contain all of those bugs and thus not be the best version of the game for worlds to be played on. If Riot was worried about implementing the jungle changes too soon prior to Worlds, what prevented them from holding those until after worlds started. This would have allowed them to implement the bug fixes prior to Worlds and now the game will be played in a broken state on the grandest scale.