The problem that I’ve with latex is that it predates most of the modern software development.

Everything is in a giant namespace. Package management is a mess and packages often conflict.

No numeric characters in method names. If you want to use numbers, you can only hack it using names like \WidthXV.

No functions in the modern sense. Everything is just macro expansion.

Turing complete but hard to write any useful code. I have seen more code written in Brainfuck than LaTeX.