I coached high school debate teams, neither that nor arguing shit over the internet are the real world because you aren't actually risking anything and they are, as we are exploring in this very post and thread, predictable.
If it was the same as the real world it wouldn't make for very good practice, now would it?
When I played sports, we spent a fraction of our practices trying to mimic the real world scenario (scrimmaging). And even in a scrimmage, it's risk free, there are no stakes.
The lack of risk is exactly what makes it great practice.
I can't agree with the idea that physical repetition is a suitable analog for any social interaction. For example, a hetero male can't get better at attracting women without being in the actual, concrete situation as it unfolds, which is exactly what is happening in coached dating situations as well.
Edit: I would go a step further and wager our brains aren't calibrated for arguing random other human beings in person we don't share assumptions, behaviors, and/or appearances with; I mean people have a hard enough time communicating with the people they've chosen to commit the rest of their life too, it's hard to conceive of being able to master a marriage without being in the marriage.