Taxes should also be included in the advertised price, then. Just imagine!
Then the price may change at the checkout if you put in a different/unexpected delivery address.
I never said it was. In fact, I specifically said that there is work to do before making the rule about listing all prices inclusive of taxes.
Do the pre-work first, and then make a rule about displaying the final price.
It's a solved problem but we can't make it happen here. Why?