Hm weird... I've never seen a 190.5cm display advertised anywhere... not even in any european country!
Almost as if the global standard for display sizes *IS* in inches?

While I do agree that metric is better for almost all things I think it would ne stupid and unnecessary to change the entire display market from e.g. 27 inch displays to 68.58cm displays

Use global standards. 75 inches??
Wait, there's a caterpillar on my silver-beet.
Ok mate, follow  the ruler. Go 75x mate...

Global standards, not North American nonsense.
From George Washington, the U.S. has been metric.
How uneducated to be unable to use base 10?
Never pamper to the uneducated. 
Be the 'bringer of knowledge'.

Did you go even to school? Odds say: "No, no I did not.
Bloody idiot.