I'm not sure how not being able to get all monsters makes monstrology a waste of time. There is still a lot you can do with it and I'm sure more monsters will be added in the future.
Considering the number of monsters that we can collect currently I fail to see how it's a waste of time. There's still plenty of content that Monstrology offers for those looking for a new experience. If you're not interested in it that's fine but saying it's a waste of time just because not every single enemy in the game can be extracted is a bit much in my opinion.
It is currently impossible to complete the monster tome due to quest only creatures being listed, therefore, I agree with the poster.
KI really needs to fix this, as well as move housing gauntlet creatures to their own tab. They way the are mish mashed in worlds they dont even belong in is confusing as all heck.
Ex. why in the world are the midnight sun pagoda creatures under Khyrsalis?