What I find interesting is that while I actually agree that 2WB as was done before was problematic, MobX which looks like previous-generation 2WB may actually be just fine because of features specific to its implementation of the idea (actions, and better tools for use in development)

Currently JS frontend folks also classify MVC as "problematic", yet a lot of successful software was written that way. So along with J2EE folks, this isn't really the community to look for style standards by default.

Honestly, given that I know of no two developers that have the same understanding of what MVC is and how the code should be divided, I have a feeling there's something wrong with the pattern itself, too.

I don't have a link handy, but I read a piece by one of the original MVC pioneers claiming that the pattern was designed for encapsulated components, usually fairly small, not entire applications. I suspect many of the quirks and disagreements between different MV* architectures derive from this fundamental misapplication of the pattern.