Dealer here, so grain of salt. The carbon shaft thing isn't really about skill level, it's about deflection and feel. Low deflection shafts let you get away with imperfect aim on cut shots because the ball squirts less, so yeah, that can flatten the learning curve some. But plenty of pros grew up on wood and never switched, guys like Efren didn't need a carbon shaft to shovel english on people. Pia's comments probably come from personal preference on hit and feedback, wood just feels different off the tip, more traditional thump versus the stiffer carbon response. Neither is objectively better, it's closer to picking a golf shaft flex than picking training wheels. If you're newer and want a rundown on what actually matters in a beginner cue, I wrote up a fuller guide here:
https://billiardhome.com/blog/best-pool-cues-for-beginners