Looking at the Ousterhout paper, I share your skepticism. I'm perfectly willing to believe that a parallel universe with datacenters running Homa would be a bet

Looking at the Ousterhout paper, I share your skepticism. I'm perfectly willing to believe that a parallel universe with datacenters running Homa would be a better world. But if I were to make a list of actual reasons too much money is getting burned on AWS bills, I suspect TCP inefficiencies wouldn't make the top 10. And worse, some of the things that do make the list, like bad managers, rushed schedules, under-trained developers, changing technical fashions, and "enterprise" development culture, all are huge barriers to replacing something so deep in the stack.