That's exactly the point and what people are missing. If you used Twisted you didn't have access to the entire Python ecosystem and there was a lot of work that

That's exactly the point and what people are missing. If you used Twisted you didn't have access to the entire Python ecosystem and there was a lot of work that was required to get standard packages to work in a non blocking way. Also callbacks for all that they're derided now were an easy paradigm to understand to get into the whole philosophy of async. The first prototypes of node supported different paradigms before callbacks were settled on IIRC.