Sometimes a Unified theory can be a useful model, but not always.

When a new clarity of thought is achieved, it opens up potential new progress. This is similar to creating a Unified theory of thought, and also to creating a unifying language A unifying language enables further discovery.

A Unified theory is more a reduction of an idea, a Useful model is a system, process, or mechanism for getting a desired result.

Solomonoff Induction is an example of a Unified theory.

Unified theory isomorphism -> A unified language

Can Probabilistic Thinking be a Unified theory for reason and belief updating? It would need to fully subordinate Bayes’ Theorem and Solomonoff Induction (the latter of which may already be a Unified theory of its own).

Similar to a Unified theory.

Logic, type theory, category theory, functional programming, and Bayesian thinking may all be connectable in a grand Unified theory.

slightly mystical enlightenment that comes with expertise, an ability to move through the world fluidly and with your Unified theory of reason and thought.