On the “Michigan-Wisconsin-Pennsylvania” ppoint, yes, that’s true, but even if Clinton had won Michigan and Wisconsin, she still would have ended up short in the Electoral College. And, to my memory, she did campaign pretty extensively in Pennsylvania, so, in order to win, she would have had to win either that or, say, Florida.
And there are solid critiques of her failings in Florida too. There are ample examples of how Clinton really tried to appeal to an ideological constituency but took all kinds of non-ideological demographics for granted.