I don't know if you appreciate the level of complexity here. We're talking about a core diagnostics system (extremely complex software), that already has guards

I don't know if you appreciate the level of complexity here. We're talking about a core diagnostics system (extremely complex software), that already has guards in place to protect against this stuff (complex again), but there was a race condition (complex again), and this one instance in likely billions and billions of transactions is what led to an issue. What training do you think could have prevented this? Microsoft deals with complex software at enormous scale. Bugs happen. And in this case, it was a severe one that's already been dealt with.