I honestly think that it's negligent on the part of public health folks to continue the practice. Saying "Drinking more than 2 drinks in X time will cause you to be legally impaired" is actively encouraging people to unwittingly drive drunk in a culture when a typical ABV for beer is about twice what it was when those standard were originally calculated, and non-highball cocktails typically contain at least two shots of liquor.
"Unit" is so much better a term.
I encounter 12oz bottles and cans of 5% abv beer literally every day
One standard drink in the US is tied to 12oz of 5% beer (or it's equivalents in wine/spirits), not the UK definition of a "unit" of alcohol.
When there are US health recommendations made, they are referring to standard drinks.
One 200 ml glass of wine at 13% ABV would be 2.6 units.
One 330ml bottle of beer at 5% ABV is 1.65 units.
Most people struggle to estimate how many units of alcohol they drink. The "one unit == one drink" thing comes from when units were introduced, when a glass of wine would be 125 ml and it would only be 8%. Those days are long gone.
One drink per day (skipping some days) is 14 units per week.
Two drinks a day is easily some 30-40 units per week.