Sure, and that is a wonderful ability to have. But what would you do if you got a perf recording from a user who was running a different version of Linux? I was

Sure, and that is a wonderful ability to have. But what would you do if you got a perf recording from a user who was running a different version of Linux? I was able to load this other person's ETW trace and analyze it with basically zero effort, and that (common, for me) case would be much harder on Linux. Once I had a repro the Linux case would be arguably easier, but I couldn't get a repro until I could analyze the OP's trace.