If not going to overclock, spending big on the motherboard isn't really necessary. I agree if you get a K series CPU, you should buy a Z series board. But a B360 is fine for any locked CPU, and B450 is fine for Ryzen users not looking to push their clocks. No 2 ram slot boards, unless it is an ITX board, though.
But that's not cheaping out, they are still good MB's as long as they get the good models.
Something like an H310 Chipset MB or comparable AMD is what I am talking about.... Picking the cheapest MB they can and then trying to make a gaming box out of it.