Yes, historically people were way too optimistic and generally went down AI rabbit holes that went nowhere, but two years before the Wright flyer flew, the Wright brothers themselves said it was 50 years out (and others were still publishing articles about human flight being impossible after it was already flying).
People are bad at predictions, in the Wright brothers case since they were the people that ultimately ended up doing it two years later they were likely the best to make the prediction and were still off.
Given that AGI is possible and given the extreme nature of the consequences, doesn't it make sense to work on alignment and safety? Why would it make sense to wait? If you accidentally end up with AGI and haven't figured out how to align its goals then that's it, the game is probably over.
Maybe OpenAI is on the right path, maybe not - but I think you're way too confident to be as sure as you are that they are not.