I think the word "luck" is misused in pool. It is an easy scapegoat for those who were on the receiving end of good or bad rolls, but I don't think luck plays a part.
I think luck is used to identify those many instances where the outcome of the shot was unknown to either or both players.
Case in point, CaliRed posted a video clip of Danny Harriman running balls in straight pool, at the end of which Danny had a horrible scratch. The CB caromed off two objects balls to scratch in the top right pocket (assuming you're standing at the foot of the table). It is very easy to say "that was bad luck"...or "that was a bad roll"...but the fact remains Danny
played the shot that made it happen...he just did not, or could not foresee the outcome.
I don't imagine the word "luck" would not be used in poolrooms anytime soon...this is just an observation. I have also been in positions where I have fretted because my opponent repeatedly leaves me "lucky safeties"...or as some might suggest...he missed well!
I won a tournament last week and the 2nd place finisher was quite irate because I not only left him safe (unintentionally), but when he missed he left me out. We have all been there, many times. It seems totally unfair, but if I predicted and announced what would have happened had I missed, would it still be luck?
It is just an indication that we did not know the outcome of the shot...hence the "lucky SOB" excuse comes into play...