The lack of appropriate plugins to streamline the process of certain events that were planned to happen weekly, there were in fact going to be upwards of 17 co-linear events happenings at the same time, but in fact even with full staff there would be no way to manually watch and monitor these events to be fair. The lack of ability to do spontaneous and random at any time events, the lack of the ability to do other key and essential things that would need to be managed with plugins that are either out of date or do not exist; to which I have been approaching upwards of fifteen developers. Some want to wait for sponge, some are very busy, and so on, but there is a groundwork for plugins going on.
The other big part intended was quests to drive the story however quests are something players would not want to walk around for and the quest manual to indicate where and what the quests were had no functionality and would either crash a player corrupting their data, or crash the server until their data would be removed so it was opted to remove it. Otherwise it would have not been enjoyable to search down quests or go check information somewhere on where to start it. It ruins the immersion. Not only that, but the quests reward had no balance with the economy, so no real incentive to get the rewards.
Considering some things there have been appropriate steps and things being built that at best can be beta tested during a few events that may be planned for Kami's