What is your personal productivity metric by which you have more than 10% increase? More money earned, less money spent, fewer working hours for same income, more leisure time? It needs to be something in aggregate to mean something related to what Nadella meant. There are many individual task which LLM system can help with. But there is also may ways for those gains to fail to aggregate into large overall gains. Both on personal level and on corporate, and economy wide level.