ctietze, 
After so many people were amazed by #latexmk's capabilities to auto-refresh a LaTeX document preview, check this out:
latex-lsp/texlab: An implementation of the Language Server Protocol for LaTeX https://github.com/latex-lsp/texlab?tab=readme-ov-file
I didn't think there would be a language server for TeX documents but there you go!
In #Emacs/#Eglot, you now get auto-completion of all macros that are loaded by your project, even your own. 🤯
