That’s probably because this is in the health forum 🙂 I am sure it would have been answered faster if the question was in the general discussion forum where most people are.
I’m don’t know as much about them as some people here but from what I have read in the Curly Girl book and on here the problem is that the build up in your hair. After using a conditioner or product with cones a few times they can start to build up in your hair and make it limp, dull or less curly. They can be removed if you shampoo regularly but a lot of people on here choose to do the CG routine and just condition their hair so they want to avoid cones