Thanks for testing. How about collection stats and career unlocks? That stuff seems to reset even upon splitting households. Let alone making a new household with an existing imported sim.
Details aside this thing will never be more then a partially usefull and (excuse my English) rather lame workaround. This whole ride through CAS belongs in the tutorial rather then in every game, IMHO.
Nobody in TS3 had trouble creating any sims. Being able to choose what to do directly at the start of a game is a thing I still hope to see one day. And just maybe by posting this, and people reacting to it, I can invite the Devs to look into it!