Considering most developers, AMD and nVidia are practically not developing it (multi-card support) I honestly don't think it's an issue.
Whilst it would be nice to run SLI'd 1080Ti's and get a performance boost, most of the games I play now don't support SLI or it's broken so not worth running, and because of that buying a 2nd hand 1080Ti would be a waste of money.
If AMD have killed off crossfire support on these card's then I think it just shows how much of a waste of time it is these days, even with DX12 supposedly making it "easier" to support multiple cards.
Either way no skin of my nose as I wasn't going to be buying one of these anyway because they are just not good enough, and I'm not about to drop £400+ by the time the AIB cards come out for lower performance, and probably the same power usage as my 1080Ti.
It's always been a bit of a crock, IMO. Both companies used to push the marketing hard, then failed to woo the Devs. Certain games were awesome, but one card now is always awesome.
I see Nvidia bleating about how the 2070 Super supports SLi. I see the inner scumbag inside them is still alive and well.
Well.. I have yet to see a card do 1440p @ 144hz on max detail. But yeah I think the last true SLI supported title was Witcher 3. Since then SLI actually has a negative impact on fps. Division 2 for example now reports 5-10 fps LESS than single card.
Luckily there isn't a single title released these days that interests me, so I am just sticking with W3/Destiny2 and older backlogged games where it does benefit me.
Its a sad day when even I state that from here on I will be going single card setup. I havent gone that route since my GTX280 days.
I suppose BF5 does support it well, but you have to block DICE trying to override the setting when you run BF5.exe. So to me that doesnt count.