Their idiotic obsession with targeting Joe Manchin (proving they don't understand WV whatsoever) seemed to indicate they were going to be worthless anyway. They should have been targeting candidates like Cantwell and Casey, who voted against Bernie's drug bill and were seats we could have been favored to hold with other candidates.
I can't say I disagree with you about the targeting Cartwell and Casey, I think your point about WV is incorrect. Watch this and see how a Bernie-like Dem would be perfect for WV. https://youtu.be/3rC3FjRZzEM
A socially conservative/populist Dem may be able to work in WV, but that's basically describes a Manchin clone on policy who supports Medicare for All and is more pro-union and as a result, doesn't identify himself as a centrist Democrat. Manchin is hideous on climate change, but in a coal state like WV, you're not gonna get any better in that department.
PJS isn't a terrible candidate on paper, but I'm not convinced she could win statewide. She's better off going after WV-01 or WV-02 IMO where she isn't risking throwing a seat to the GOP.