I think it's never too late or too difficult. That was the attitude people had toward toddlers and pets, before they arrived. And I have to keep hopeful for my peace of mind.
But we've been asking for this from the start, and still no changes have been made, and still new packs are coming out sacrificing substance for moodlets. That scares me.
The personalities and reactions of the sims are, to me, the core of any sims game. Without an update like this, I would never feel satisfied with Sims 4. So I can only hope they're either working on it, or start doing so.