I don’t think that’s fair. Yeah, there is a lot to learn and keep track of. At the same time, it’s an inherently complex problem. From one POV, and async Python program looks a lot like a cooperative multitasking operating system, but with functions instead of processes. It was a lot harder to write well-behaved programs on classic Mac OS than it was on a Commodore 64, but that Mac app was doing an awful lot more than the C64 program was. You couldn’t write them the same way and expect good results, but instead had to go about it a totally different way. It didn’t mean the Mac way was bad, just that it had a lot more inherent complexity.