At the very least get the history right. Fahrenheit was defined so that a temperature stable brine solutions temperature was zero, because it was easy to create for calibration, and that the freezing and boiling points of water would be 180° apart, because circles and temperature gauges have a natural link.

Redefinition of the scale to make it line up with metric has led to some minor drift in the definition.

The good criticism of fahrenheit is that it's non standard, not that it doesn't have round numbers for two states of one substance.