[theoj]

The job has nothing to do with it, it's about the co-workers. You're not doing your job at lunch, you are interacting with your co-workers.

[ktsmith]

I'm interacting with my co-workers while doing my job. I don't have any desire to also interact with most of them during my breaks, which includes lunch. Part of my lunch is to not just take a break from my work, but to take a break from the people I work with.

[maigret]

If your work is an island and you don't collaborate with anyone, that is probably true.