CC and Mods are two very different things. CC is just graphical images; an overlay on the Sim's 'intelligence'.
Indie teams are okay with making games moddable because they often use older engines themselves. EA's Devs don't have the time to make new packs AND make sure all your Mods work. I don't use any Mods and my game very rarely bugs out, aside from the 'infinite food' going around where my Sims make new food all the time and never pick up old food. And that's not a bug. That's a problem with gameplay. If your sims aren't going to a certain place, it's often a pathing problem, sometimes with bb.code.
Usually when a game breaks with an update, it's because you have old Mods conflicting. Especially the ones that affect gameplay. The Fear Update has probably demolished its way through any emotional Mods you had, and maybe anybody who had made Fear Mods has decided they don't have the time to update.
