One practical advantage of using free tools is that everyone in your company can use it, you can write automation that uses it, etc. I'm not going to defend LaTeX in particular, but there's a lot of value into using something (like Markdown or reStructuredText or whatever) that anyone in your company can propose edits to, where you can automatically publish nicely-formatted (e.g. HTML) documentation when anyone in your company makes a change, and so forth.
Another way of gaining this advantage is to use something you're already paying for like an internal wiki.
I’m not recommending anyone use InDesign or similar tools for everything.
It’s a typesetting tool designed for producing paper documents. You should use it for your company’s magazine, menu, posters, and published books, not for your auto-generated technical documentation, your blog posts, or your internal emails.
The previous commenter wrote about what to do if you “don't want to spend a few $10k on professional typesetting software.” That’s much steeper than most people will spend on professional typesetting software.
Another way of gaining this advantage is to use something you're already paying for like an internal wiki.