I don't use custom traits, aspirations or careers. Those are very prone to breaking with every patch and some modders are not in too big of a hurry to update them.
I use about 200 other type mods, so I know all about waiting for modders to update their mods before I can use them after an update, but if I use a trait or career and it breaks and that modder decides they don't want to update the career or trait anymore, I run the risk of completely messing up my save and/or sim.
It's just not something I feel the risk is worth, to me.
Now, once Sims 4 is over and no longer receiving patches, I will heavily mod my traits and careers, until then, I'm fine with what the game gives me.
