In my experience, LaTeX has the advantage of being able to handle even very complex documents and books. LaTeX can be challenging to master, but in return it can produce amazing results. See some of the references below. In particular take a look at [4] (it's a 1200 page LaTeX document) and consider if it could be written in Markdown and Asciimath. The hundreds of graphics appearing in [4] are also produced by LaTeX--the document is the manual for pgf/TikZ a popular graphic package that is itself a set of LaTeX macros.
In my experience of writing my BSc thesis in it, it's an absolute trainwreck to work with, especially with Overleaf. Takes forever to compile, won't ever give you a single useful error message, as for Tikz I'd much rather make a proper svg in literally anything else and then import it.
One can also produce amazing results programming in assembly, but I sure as fuck ain't doing that for anything I actually need to get done.
[1] https://uva-fnwi.github.io/LaTeX/week2/maths2/
[2] https://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics
[3] https://tex.stackexchange.com/questions/397453/what-are-all-...
[4] https://pgf-tikz.github.io/pgf/pgfmanual.pdf