My personal opinion, and this is coming from someone who only plays with old school Huebler's and wood shafts, is that CF is simply more consistent. Whether it's low deflection or not is irrelevant, it's more consistent and that's where the money is. As mentioned, I have mainly played with Huebler's since the late 80's and I have tried a ton of CF shafts, they're just not for me. But at my age (apparently I'm elderly) I'm not interested in the work I would need to put in to convert to a CF shaft, I'm also not a fan of the black shafts, but that's a personal opinion. However, I do think it would be beneficial for younger players to use CF and I think Savannah switching to CF will only benefit her.