Neptune's Bounty can be used as a chest for crafting, which is very annoying given how hard it is to obtain compared to normal chests. Especially in storage systems, like refined storage, where autocrafting is a possibility, this gets in the way a lot. I don't really see why it should be equivalent...

I'm playing the modpack Seapolis: submerged, and already tried reporting the issue on their discord, but they sent me to contact the mod author directly