The anglo-american crowd shows its lack of practical experience with the metric system.
"about 18” tall" does not translate to "45.72 cm". Look at a ruler to get an idea about the level of accuracy you imply (your rulers have metric on the other side, right?), don't just copy and paste from the calculator. Just say "about 45 cm" or even "about 0.5 m". I guess the distinction is hard if you're not used to thinking in metric.
Reminds me of the milk bottle I saw in a UK supermarket that said "2 pints, 1.13652 liters". Could I complain if the volume was off by a hundredth of a milliliter?
Another favourite is the use of grams in anglo-american cooking recipes for our "benefit". Who the heck measures flour by the gram? Come on, 1 cup is 2 deciliters for all practical purposes, you need to manually fine tune the consistency of the dough/batter anyway. In my kitchen we use a deciliter measure, a table spoon, a teaspoon and fingers for pinches.
A pint because it's a recognized unit for beer world wide.