[dsr_]

The Concorde was cramped. JFK to Heathrow took five hours (3 in the air, an hour in each airport) plus the time for first and last miles. JFK to Heathrow today is 7 to 8 hours with the same provisos.

If you're going to spend a quarter of the day travelling, why not spend a third of the day and do it more comfortably?

The F-35 isn't the fastest jet; fighter jets aren't business jets; apples are not rutabagas.

[torginus]

It's about pushing the envelope. If your technology is limited by certain physical constraints, then all of the things you make will end up being constrained by the same stuff.

After a short exploration you can reach the conclusion that nothing new is worth inventing any more.

Only by loosening those constraints can you make something that's meaningfully better.