I haven’t read through the other responses in the thread, but I don’t think it’s the slightly old software that’s the problem. I think it has more to do with using older kernels, meaning that the latest hardware won’t always be supported (on the stable branch at least - there’s always testing and unstable too of course which may have better hardware support).
That may have changed with recent releases though - I haven’t used Debian for several years now. But if your hardware is supported then it’s a pretty solid choice.
Some other people sometimes mention that Debian isn’t as beginner friendly as Ubuntu or Mint, but my experiences have been similar to yours - I found Debian to more user-friendly than Ubuntu for example. Assuming that the hardware works of course - if it doesn’t then it obviously is a worse choice.
I had the same idea to write my CV in Latex, but then realized it’s not such a great idea. I wanted to keep it down to 2 pages, so I ended up having to do a lot of manual formatting (font size, margins, spacing), and the whole point of Latex is that you’re supposed to let the typesetter do the formatting for you. So I switched back to Libreoffice.
But if I had a long-form CV, ie. an academic-style CV where you list all publications, conference talks, etc. with no regard to length, then Latex would be ideal for that.