Unlike me who will be playing the game on (very) high probably ( I LOVE my new i5 3,5 Ghz and GTX 970 PC
) most people will probably play on medium settings or slightly above, and on PS4 and XboxOne the game will also look (probably) like a mix of medium and high settings. Which means that most gamers will experience the graphical fidelity shown in most trailers.
Would you have told me 1 year ago that showing a game at full graphical potential is a mistake I would have called you a madman. But with (actual) scandals like those we have these days, with the outcries and shitstorms we had recently and gamers seemingly getting pissed just because they are already annoyed by all the companies around them continuously lying to them about all kinds of things regarding the game and falsely advertising things I think it is a VERY GOOD idea to only show high settings.
I mean, don't get me wrong, there will be people which will find a reason to complain anyway, there always are. But that way they at least do not have a LEGITIMATE reason to complain.
I think it is better showing a middle ground. That way neither console gamers nor PC gamers with mid-class PCs will be disappointed by the game. And let's be honest, everyone of us who actually can play at (almost) max. settings will be even happier when we finally see them on our own screen.