@clacke
The argument about tipping is quite different, and I'm much more sympathetic to your view there. The pro-tip folks say they want to be able to vary the tip based on service provided, traditionally 20% would imply good service and 10% very bad service and 0% means the customer is considering pressing criminal charges.

Studies have shown people don't really do that, though. Tips mostly vary based on how cheap the customer is.

@clacke
The problem with including sales tax is that people get confused if a handful of items include it and most do not. Most items have price tags printed in one place and used in more than one town, county, and even state, so they'll have radically different amounts of sales tax.

@clacke
All millenials are adults.
> people born from 1981 to 1996.
Some zoomers are adults.
> mid to late 1990s as starting birth years

sauce: Wikipedia