No one designing an app interface can view it on anything newer than an iPhone 6.
People designing web applications and sites get a 17-inch monitor at least 5 years old.
All performance testing to be conducted on internet found in rural America.
Every 2 weeks, your mouse and touchpad vanish for a day.
Any strings not prepared for localization to be rendered in Wingdings.
Chatbots will take up the same proportional space on the screen, with the same frequency, for developers as users.
Some really common two-letter code will be replaced by a pick list.
Any API documentation referring to just reading the code will render as ASCII art of a rude gesture.