It seems unfair to conflate the rationalism of Berkeley, Locke, Russell and Hitchens who hold critical thinking in the highest regard, to AI maximalists, who seem to be using rationalidm mainly as a cover for their own pet ideas on social reengineering.
The former is mainly about being true to the scientific process of evidence-led discovery, while the latter is... whatever it is (but rational it is not). From a critical thinking perspective, there is no evidence to suggest the current form of AI could achieve superintelligence, and mechanisms that could enable ASI have not been discovered yet. Their perspective, on the other hand, is far more activist.
I meant the modern community, I think they adopt the same “Rationalism” name. Basically the LessWrong community but HN is also pretty adjacent.