Yes it's a good mindset for an AFC, because it'll help you get over any anxieties you may have. But it doesn't really help your inner game, unless you aren't interested in becomming a real man, rather just another fake guy who gets a lot of girls (which I have no problem with, but it's definately not the life I want to live).
The best mindset is being a MAN. If you're out with a girl, just have fun. Don't restrict it to friends. Embrace your sexuality. If the opportunities arise, kino, escalate, kiss, whatever is needed.
Whenever the outcome is not what you had hoped it would be, WHO CARES? You can't do anything to change it so don't worry about it!! It wasn't meant to be just be happy you gave it a go, laugh it off with your mates over a beer and get on with your life.
Life's too short to worry about anything - just live it.
Most people's view on failure is an illusion. NOT going up to a girl and talking is FAILURE. Any second that passes that you aren't furthering your success is true failure.
Having a nice chat to a hottie at a cafe but her rejecting the number, that's just plain BAD LUCK my friend... Say "well see you around then, have a nice day", give her a nice smile and walk off laughing - learn from the experience. The only time you ever have the right to be pissed off is if you ever get rejected rudely or anything like that, which in that case, do whatever the **** you want because that ***** isn't worth your time of day.