Blow out winterizing question

I dont use a drop of air. Just pump the pink stuff through every part of the system with the water heater bypassed. Once thats all done, I open all the low points and the fixtures for the winter. In 5 years in the Mid Atlantic area it has never failed me. All of the water is out of the system, whatever antifreeze that stays in the links after the low points and fixtures are open have lots of room to expand and avoid a blown out on the PEX lines.