Most sites? I can't even begin to fathom the logic behind that.
B365 is just an LGA 1151 socket motherboard. Any PCIe 1.0, 2.0, 3.0, 4.0, 5.0 card will fit in the x16 slot. Might be a few exceptions for very early PCIe 1.0 graphics cards, but they are also way outside of driver support. It will also have no issues with late model cards that don't support traditional BIOS but require UEFI. There is some truth to the opposite of putting brand new cards in older boards, but that is a software issue not hardware.