Please provide an explanation why you think what you think Turbine D. If you're saying it because the Program won't make the 2300 jets touted, then sure, that diminishes the return; by exactly how much will be determined by the final production run numbers. You clearly seem to know these so do share.
PhilipG, software stability has been sorted for some time now. It was an issue, but no more. As to F-35 needing its hand holding in missions you've got me; I've no idea what you're on about.