It is increasingly rare that I see a restaurant check without a suggested gratuity amount. Now there are more of the remote devices presented by the server which offer the suggested tip as a prerequisite to having your credit card returned.
The paper slip with the suggestions (on the pre-tax amount?) and the pen will soon go the way of the dinosaur.
The slip without a suggestion is a challenge of the mind and is becoming a distant memory.
And now one can pay on the app with no human interaction whatsoever.