IMO, NuSpock being more emotive than prime is logical given his different life experiences. The. End. Not enough for you, then consider how, when he went back 5000 years in time, he began regressing to a more primitive state - same as how Vulcan's of that time were behaving back on Vulcan. Now apply some NuMysticism to the mix and we get a more emotional Spock BECAUSE Vulcan was destroyed, some magical link between them was broken thus scarring and altering NuSpock. For needing to explain it to you I must ask you turn in your membership card. That goes for everyone stuck on some bit of minutiae, apply some salve to the butthurt and think like a Trekker!