I think you are missing the points to the answers to the questions related to the posters you have quoted.
If I was offered a salary to trade for a prop firm, why would I not take it? I am making money by trading, and win or lose I am still making money. Sure, if I kept losing for the firm, I would not be employed there for long. But I reckon' it takes a bit of the stress out of trading. I figure trading for a prop-firm for a salary is an in-between of trading your own money and trading in sim. You are stressed, but not as stressed?
Anyway, you appear to be argumentative for argument's sake.