If traits were more meaningful and it more than just add moodlets, I'd say yes. But for right now I say, why does it matter how many traits a sim has if they barely do anything. They could give each life stage 40 traits slots, but it matters little if the traits themselves are so dull. I'd like a trait overhaul to be a priority over simply increasing the amount sims should have.
To answer the second question, I think all life stages should have at least 3 traits. If they want to add more for older sims that's fine, but 3 should be the minimum for everyone. It's ridiculous to limit children and toddlers to one single trait.
