I think its still quite bad for debugging. I get a lot of "look here" for errors, but there are still times I set breakpoints on the internals to try and figure out what is going on. Usually in combination with some babel plugin messing things up, or some webpack caching issue, etc. I still think more could be done here, but adding the necessary debugging stuff would bloat the core.
> Redux is king
Redux is quickly going out of fashion. Interested to hear your thoughts on how long you think it will remain around though or evolve. When I look at redux-saga/redux-observable projects, its incredibly verbose for such simple things. And there seem like very simple solutions on the horizon with suspense resource fetching stuff.