Everyone might know how much 10ml is, or 1cl as physical amount of liquid. That doesn't matter though. You have to know how potent 1cl of alcohol is before that helps you.
yes it dose matter, it makes it easier to visualise, brings us in line with Europe. It is far easier to teach.
You know it as you give a darn and have used it for a while, not everyone does. I think you'll find more people use I can drink 5 pints and 3 doubles as measurement and not units.
Information isn't only there as a gauge of how drunk you want to be.
