Your favorite color shouldn’t be blue, it should be yellow…. Haha.
Obviously the 223 has an advantage in velocity and availability, but if you want a 5.7 bolt, why not?! I think it would be an awesome little trapline or bumming around rifle. Like a modern 22 Hornet. Not everyone needs 223 velocity or cheap bulk ammo. I’d love a little 5.7 bolt action if it was well done. Or even an accurate break action single shot. Put a good rimfire suppressor on it and shoot varmints and small game in class.