Cumulative time wasted using 'Command+[': none. Cumulative time wasted due to overloading of the backspace key: hours. Relying on current context to determine

Cumulative time wasted using 'Command+[': none. Cumulative time wasted due to overloading of the backspace key: hours. Relying on current context to determine the behavior of backspace was a terrible idea from the start. To hell with your muscle memory. Re-learn a shortcut that makes sense, and which will save you time one day, rather than insisting with hacker-machismo that you've never lost data in a form.