His criticism for Minnesota is that it’s too busy and has the name of the state on it. There’s currently a flag redesign in progress that (if all goes well) should go through in May that addresses his complaints:

@TonyPepperoni That's a beautiful new flag!

I assume this doesn't count Utah, which won't become official for another year?

@Eiim Correct. IIRC that one wasn't a suggestion, CGP Grey liked it as is.