A few reasons to allow them:
I recently found that there are best practices and document organization methods. That is, splitting the documents based on sections, tables and so forth and using input tag to include them.
When I started, I often did not know the existence of particular features like "theorem" environment or the "listing" for source code. I also feel that the usage of TeX macros with "def" and LaTeX macros "newcommand" and "environment" are not obvious to newbies.
Each prof/researcher has their own method of reducing the space wasted, creating interesting effects, generating review notes etc.
I was wondering if LaTeX documents are welcome on Code Review.
I can also see the cons of this:
Because LaTeX in some sense is in the same category as HTML, and I am unsure if the community wants to review site designs, nor am I clear if HTML is code in the programming sense.
Another issue may be with presentation. The LaTeX documents are typically long, with content rather than code taking up the prominent place. Perhaps it can be worked around by using placeholders for content?
And where does the review stop? Do we correct the layout as well? What about usage of specific terms like "theorem" "claim" "lemma" etc. that non native speakers often get wrong?
What does the community think?
(Note that the intent is different from the LaTeX SE site.)