It's "more a personal choice" than a "necessity".
My point of view (there are many others) is to remove as much water from the system as possible before adding antifreeze. That way the antifreeze is not diluted and less will be needed to achieve greater protection. By removing the drain caps and using compressed air (at about 40 PSI) almost all of the water in the plumbing can be "pushed out". That allows for "close to 100%" antifreeze solution as soon as the "pink appears" at each faucet.
Is draining the system really necessary? If you live some place with sub-zero temps during the winter, the stronger the antifreeze solution, the greater the protection and the less likely that freeze damage will occur. On the other hand, there are places where winterization isn't needed at all, so depending on where you live and the temperatures you'll see, different "techniques" to winterize will be all that's necessary.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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