I see, that is quite disappointing. I was hoping that integrated gpu could be useful somehow. It would be nice to have itx motherboard in one of those super tiny cases.
If this gpu is "useless" and can't run even AmigaOS in reasonable way I would not bother in including it at all in this motherboard, but as usual not my choice to make.
Of course it can be used.
Hardware acceleration isn't an absolute requirement.
And some of the PCI-E cards that are supported under OS4.1 can be had quite cheaply.
I can find Radeon HD 6450 cards on eBay right now starting at $13.95, which would allow dual OS4/Linux support.
And Radeon HD 7450 cards start at $15.
Personally, in half height cards, I rather like the HD 8490 or the R5 230 (both use the same core).
And R7 240 cards aren't that expensive.
BTW - I had thought the $500 price point was for the board only, if its for the entire system, all the better.