Ric,
Why do they say it? Because it's true.
WRW has low revs compared to the average PBA player; he has medium to just above medium, when compared to the average league player. Everything is relative. If you notice when he does play inside and uses a larger hook, he cups his wrist more, keeps his finger further inside and comes around the ball more, with slightly slower speed then when he pipes the ball up the gutter, as he does on many TV shows. You will see this better if you watch his qualifying and match play because he has to play a wider variety of styles due to transitioning oil patterns. FYI you will also see versatile players like Norm Duke and Chris Barnes doing similar "magic".
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"Just because you can do something does not mean you should do it."