Another thing that's endemic in Rationalism is a kind of specialized variety of the Gish gallop.
It goes like this:
(1) Assert a set of priors (with emphasis on the word assert).
(2) Reason from those priors to some conclusion.
(3) Seamlessly, without skipping a beat, take that solution as valid because the reasoning appears consistent and make that part of a new set of priors.
(4) Repeat, or rather recurse since the new set of priors is built on previous iterations.
The entire concept of science is founded on the idea that you can't do that. You have to stop and touch grass, which in science means making observations or doing experiments if possible. You have to see if the conclusion you reached actually matches reality in any meaningful way. That's because reason alone is fragile. As any programmer knows, a single error or a single mistaken prior propagates and renders the entire tree invalid. Do this recursively and one error anywhere in this crystalline structure means you've built a gigantic tower of bullshit.
I compare it to the Gish gallop because of how enthusiastically they do it, and how by doing it so fast it becomes hard to try to argue against. You end up having to try to counter a firehose of Oh So Very Smart complicated exquisitely reasoned nonsense.
Or you can just, you know, conclude that this entire method of determining truth is invalid and throw the entire thing in the trash.
A good "razor" for this kind of thing is to judge it by its fruit. So far the fruit is AI hysteria, cults like the Zizians, neoreactionary political ideology, Sam Bankman Fried, etc. Has anything good or useful come from any of this?
