IMO, doing hard/dedicated fitting types on the valves, like that, wouldn't make sense. For one thing, with either NPT or TC connections on the valves, YOU can use whatever you want on them. Having a QD, or barb, connection part of the valve means more items to stock, get from suppliers, and other logistical headaches that will drive up the costs and down the supply.
IME, all TC connections (like the Spike+ kettles) means YOU get to put whatever you want onto them from that point. I'm actually GLAD I did that since I've gone from the QD (ball lock style) to all barb fittings since getting the kettles. IF I had to replace all the valves as well, that would have both driven the cost of that change up (by not a small amount) AND I'd have even MORE things hanging around unused.