Sometimes this is true, but it misses some things.
Sometimes the cost of failure appears low, but is actually massive because the failure mode is not understood. For example a spreadsheet that miscalculates and causes a bad investment decision and a corporate failure.
Software is often chosen because it trades off against weight (in physical systems) or people (more commonly).
Software is fundamentally different because it is not commonly toleranced or the tolerancing of software is not understood. Reliability in physical engineering is understood in terms of the limits to which a component can be pushed. This concept seems not to be applicable to software.
Sometimes the cost of failure appears low, but is actually massive because the failure mode is not understood. For example a spreadsheet that miscalculates and causes a bad investment decision and a corporate failure.
Software is often chosen because it trades off against weight (in physical systems) or people (more commonly).
Software is fundamentally different because it is not commonly toleranced or the tolerancing of software is not understood. Reliability in physical engineering is understood in terms of the limits to which a component can be pushed. This concept seems not to be applicable to software.