Very true. This is an issue a lot of young spinners (especially wrist spinners) have. They think it's all about turning the ball big and work a lot in the nets on doing just that. In reality, your job as a wrist spinner is to take wickets. Turning the ball big is neither here or there. It's all about sussing out the batter, working out his weakness and exposing it. It's fairly commonplace to refer to Warne, but for obvious reason. He was such an effective bowler because he was always one step (if not two or three steps) ahead of the batter.
I did this myself for many years. I would be far more interested in trying to impress everyone by turning the ball 2 foot than actually worrying about getting the batsman out, as a result I bowled too short, too wide and too slow.
It took me several years to figure out that if you bowl full, straight and reasonably quick, then the ball only has to turn 6 inches to be virtually unplayable - and in many ways its better to only really turn 2 or 3 balls an over than to turn every ball 2 foot.