VATS was a terrible integration of the aiming system of rhe early Fallout games.
Fallout 3 implemented VATS because Bethesda didn’t know how to incorporate guns well to the game, this was self admitted. Bethesda had proven they couldn’t handle the IP in a lot of ways this one just one of many.
New Vegas isn’t focused around VATS. They actually disliked the system and designed gunplay to be better than Fallout 3. You can actually ads in New Vegas.