Super impressive, but I agree with this, it was an easier project to plot on a spreadsheet and forecast a path to profitability.
Using current technology and looking back at the Concorde to make any predictions on supersonic passenger travel generates a spreadsheet with a lot of red on it.
If somebody wants to burn their time and money trying I am totally cool with it. If they succeed in their vision they will be handsomely rewarded and transport gets faster. If they fail they still tried to make the future more amazing.
Using current technology and looking back at the Concorde to make any predictions on supersonic passenger travel generates a spreadsheet with a lot of red on it.