"Chick's collection story" Not a fair accusation considering it doesn't end up as harem.
If you insist on not having an all female cast then maybe you guys can just make a genderswap version of this story and call it Release That Wizard.
One of the 'biggest problems' is that all problems are technically solved via 'plot device convenience', such as Anna being a genius, conveniently timed /powers for a Witch's appearance such as Nightingale being able to tell whether one is lying. However, this is something all fictional stories are guilty of. The only problem left is how badly they force it in.
The only other problem I have with this is the 'policy-making'. Take education for example. Roland digs out past memories and have a witch write a book about 'How to Teach Students'. The teachers that read this book could immediately do extremely well because the book is just that amazing. However, as a person who studied 'How to Teach 101', I can tell you that there are so many 'correct methods' even though these methods are literal opposites of each other.
Just so you know, I am mostly talking about disciplinary actions, how to keep people motivated, etc. Some students cause problems for attention and should be ignored (they actually want to be scolded because they get the attention). Some cause problems because they don't know better and should be scolded so that they could learn. All these things are not something an engineer should know and if they are not addressed, problems may appear.
But, plot devices are a magic of its own and the book gets overly praised.
Either that or I am REALLY underestimating feudal idiocy.
Quite a good story compared to a lot of the other Chinese stories. (Biased opinion as I really, REALLY, hate Dragonball style stories with immortals, planet destroying fingerpokes and the convenient legendary artifact that helps trash become Superman)