This becomes tiresome at some point, but here we go again. Win goals and loss limits keep you from losing back your profits or exceeding a comfortable loss (for that particular person's bankroll and tastes). That cannot be bad. It doesn't change the MATH; but it takes out the extreme lows and maybe some extreme highs.

But let's get back to the MATH. All that is is probability--it is not a definite result. It tells you the probability of something happening. As we all know, every hand, every spin, every hour, every day, there are millions of deviations from the probabilities, otherwise no one would gamble. So if, during those deviations, you take your profit or limit your loss, you have done a good thing.

And let us not forget that most of us are playing a negative game---therefore, if as Arci says, win goals and loss limits result in less play, mathematically that is good.