My reason too!The best reason to put a high magnification zoom scope (ex: 4-24x50) is so that you can evaluate an animal or rack before you pull the trigger.
I have had 8 back surgeries and have other health problems so I cannot carry a spotting scope and my bino's are light but adding spotting scope will keep me in the truck.
4 years ago I spotted a heard of elk and my scope prevented me from tracking a heard of cow elk.