Witcher 3 doesn't do any of these things better than Fallout 4...
Witcher 3 is a game that did a promo talking about how they tackle real world issues like racism...and then every character in the game is white...
Fallout 4 is a game that gives you a choice of simulating the underground railroad...and then it actually lets you pick the race of the two most important people associated with those quest...and then it lets you choice what side of the story you want to be on...and even goes so far as to force you to kill the other side...
One of these things is good story telling...one of these things isn't...
And I am pretty sure Witcher 3 won game of the year because Fallout 4 hasn't even been out a full month yet...

How could Fallout 4 even be nominated?
When did Witcher 3 even come out...in the spring?
The fact people are comparing a game that came out 6 months ago to a game that hasn't even been out 6 weeks speaks volumes about both of these games...
I was a Witcher stan all the way up until 3...I doubt I ever play another Witcher game again...