It involved particle Boundary Theory, string theory, energy theory, and a motley of advanced mathematics; even the issue of mass point configuration had to be understood.
The barrier was simply too high.
A person's energy is limited; to understand such a plethora of subjects, an ordinary mathematical theorist would need at least several years.
If one were to write a book solely on the foundational knowledge related to anti-gravity, it would mean gathering all related fundamentals in one book, while excluding unrelated content, which would certainly make it much simpler.
"That's a great idea!"
"Once the writing is finished, it could be given first to domestic professional mathematical research institutions, and later it may even be sold to the whole world..."