Also I would say that the statement "The DOM is extremely challenging and working to the DOM destroys architecture" is a straw-man here, or at least a red herring.

The DOM is not all that challenging. It can be a tedious API, though. React shifts much of the effort to manage element and attribute changes to an algorithm, thus relieving tedium. Many folks find managing the DOM through a functional paradigm to be an enjoyable & productive approach to working with client side web apps.