After ep 4 it quickly goes downhill it reminded me of the later dragged out spreadsheet episodes of neon genesis so I assume they got in financial trouble or something.
No development during the hostage arc, they just brought in some quick convenient patches to fill the holes in their narrative and then kept explaining us why they wrote them which ruined immersion and the whole OVA for me.
An example of this is their repeats of why paku wasn't able to tell anyone, them explaining that gon and killua are valuable hostages because the leader was captured.
There's way more if you pay attention, the entire ending was like this, adding undeveloped details for convenience.
