I'd say that really depends on what your work environment is like. I've worked places where I'd much rather eat at my desk, quietly reading a book or newspaper, than go into a loud, crowded breakroom/cafeteria where I was either ignored or expected to talk to people I couldn't be myself around.

We don’t disagree, my point is to treat lunch as a complete break (even if it’s just to read at your desk) rather than powering through every day to try and leave a few minutes earlier.

Agreed. I make it a point to never discuss work related stuff during lunch time.