That'll be exploited as well. The number of pointless UI and feature changes would skyrocket without the app actually getting better or gaining meaningful funct

That'll be exploited as well. The number of pointless UI and feature changes would skyrocket without the app actually getting better or gaining meaningful functionality. Meta-metrics might be much more helpful, though harder to come up with, quantify and monitor. Things like defect rates, user reported incidents, user satisfaction, stuff like that. Things that cannot easily be gamed from within the development process and that are still directly linked to the success and economic viability of the product and its development methodology (though on a higher level).