http://en.wikipedia.org/wiki/Limp_wristingedia has a good explantion of limp wristing http://en.wikipedia.org/wiki/Limp_wristing
I have been shooting for 50 years, qualified expert on .45 and M16 and I learned something today. I don’t think I have ever had this problem but then most of the guns I have shot are heavier frame.
I know a lot of people, including police officers who love their Glocks. They shoot well on the range but I just don’t care for them much. OTOH I love my Taurus 809 and a lot of people wouldn’t buy Taurus.
I don't think this would ever be a problem for me...but it is nice to know just in case of having to fire with an injured arm or from a bad position that might cause limp-wristing.
It is also nice to know since I have recommended Glocks to women friends.