I think your parent comment was saying that LaTeX alone is sufficient. You also seem to be saying that LaTeX alone is sufficient while using Org mode. Would you please clarify if I am interpreting your comment correctly or not?
I'm not saying either. The parent said it's easier and cleaner to use LaTeX all the way. I was pointing out that it is easier to write in a format like Org mode and export to LaTeX (whether via Pandoc or Org mode's built-in exporter).
Of course LaTeX is "sufficient". It is also, IMO, painful.