Maybe there is content planned for that and we just haven't gotten to that point, I already defeated the warlord and i've only gotten so far into the second "arc"((?)) Some of Content in question is work in progress.
Even if that's not really the case. There are quite a few other characters that can be utilized.
There's also a lot of different bugs that also need to be tweaked out. So i'm pretty sure the dev has things that are more higher priority at the moment. I've noticed that certain items don't appear or just can't be utilized, Even if the player in question has it in their inventory or directly on their character.