Yeah - I am well aware of the many different styles of glass in general and that some brewers prefer a particular shape. But the original comment was about size not shape, and I assumed this was what was meant when a follow-up comment noted that bars charge by alcohol strength and volume of beer sold (which, incidentally, might be a better universal system because it would mean consistent pricing and that the consumer knows what they are getting, alcohol-wise; on the other hand people expect to drink a certain volume - pint, half-pint, etc - and are perhaps assumed to understand the alcohol strength of their chose tipple given that it is mandatory to display it at point of sale in many jurisdictions).
So my inference is that if they charge according to ‘units of alcohol’ rather than solely by volume, then there could a very wide and random selection of glass volumes. But maybe that wasn’t what was being said. And I was going to say that this is all getting too arcane and technical for a topic like this until I realised it all started by showing how two very different looking glasses had similar volumes! 
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