Select: departure airport, departure date, and return date (optionally price range). Do not choose a destination.
See: a map of destinations with price labels shown for major cities.
Set: the max price and see possible destinations fade away.
Click: on a destination dot on the map and instantly get details of available flights.
All without pressing a single "submit" button and without entering a single destination.
Ah well.
It turns out it's very hard to do for reasons mostly to do with decades-old technology and business conventions in the travel industry. This is why it still barely exists, even though so many travellers want it.
But we're making good progress. Stay tuned.
Next you'll be wanting "somewhere new" and "somewhere fun".
A "first world problem" if I ever saw one...
First world problems are still problems. And the existence of people experiencing much worse problems doesn't mean those first world problems are not worth solving. Indeed, virtually any problem could be considered not worth solving if you can identify anyone anywhere in the world in a worse off situation. Typing in a couple words and having a machine return documents automatically based on the input isn't a solution to a real problem, because people exist in East Palo Alto who are functionally illiterate. Finding a cure for Alzheimer's isn't a solution to a real problem, because a supermajority of people in Zimbabwe die decades before they might even get it. It's all a matter of degree.
And if you buy into market economics, it's not even clear that focusing on first world problems is a detriment to solving other problems. If the parent spends 10 minutes buying a plane ticket instead of 2 hours because of the implementation of an "everywhere" option, that creates a consumer surplus that could very well be worth a couple hundred dollars. Flyers can be routed to places on planes that are underutilized, reducing GHG emissions by a meaningful amount (which is incredibly valuable for residents of developing nations). Hundreds of thousands (millions? I don't know the market size) of person-hours could be saved. Some of that value inevitably would trickle down to people with graver problems.