Why wouldn't a water soluable oil mix be better than the green stuff in the radiator?

It seems to me that if you live in a climate where freezing temperatures is not an issue, you only really need to address the problem of corrosion and I would have thought soluable oil would be far superior to the green stuff as a corrosion inhibitor, all the while allowing the cooling process.Why wouldn't a water soluable oil mix be better than the green stuff in the radiator?
Oil only prevents ferrous oxide in atmosphere (rust) by putting a thin film on the metal to prevent oxidation by stopping air reaching the surface of the metal.





In cooling systems, oxidation could only occur if the system was empty and therefore full of air. There are 7 different kinds of corrosion and the 3 big nasties in cooling systems are, osmotic, atomic and electrolysis. Therefore specially formulated corrosion inhibitors are necessary, based on ethylene glycol.Why wouldn't a water soluable oil mix be better than the green stuff in the radiator?
And when you sell it and someone drives to a cold climate they're in deep doo doo. That's why they have a universal system for cooling systems. People don't have to be concerned with whether their car is compatible with the climate they're going to use it in.
and what do you think antifreeze is, bubble gum? it is a water soluble oil, with the needed corrosion inhibitors and rust protection. AND it increases the boiling point and drops the freezing point of that liquid. it all works well as a package.
If it's water soluble, you would still need corrosion inhibitors and other additives - and you wouldn't have the antifreeze protection - so, in a nutshell, where's the benefit?