As noted, with cup and cone you will get far better performance out of your setup.
The problem is that people do not (1) maintain their equipment and often if they do (2) they do not know how to do so properly.
(1) if you do not maintain a CC hub, grit gets it and then starts wearing away at the hub shell .... then you need to throw away the hub and replace with a new one. Should you have abused a sealed bearing setup, you just pull out the bearing and slap in a new one.
(2) CC can be overtightened when set up, it needs a little play in it.
(3) CC is still a damned good bearing solution, it is just the user that is the weak point in the equation.