Good question. Perhaps the best explanation is that the Republican party at large has shifted since Trump came along. Before him, OH was a true swing state. PA/MI/WI were fairly solidly Dem... not California-level Dem but still reliably blue for a generation. I don't think this will just snap all the way back to how it was when the next Republican nominee comes along, especially if future Republican candidates espouse the things that Trump has campaigned on.
I wonder what dynamic is so different in OH vs the states you have listed here. It seems like such a similar state to those in a lot of ways demographic wise.