Personally, I like the pre-tax amounts displayed. I should know that I am paying 10 dollars for a shirt and that the government is taking an extra dollar. Rather than just being told, the shirt costs 11 dollars. Price tag saying 10+1 would be fine, but tax should always be displayed. Taxes shouldn’t be hidden.
Imagine it like a car steering wheel.
You’d say turning the wheel to the right turns the car right.
Think of it like this. Like your hand is holding on the top of the steering wheel.