It seems that CRYENGINE games and the Far Cry developers are the only ones who get soft shadows without massively impairing performance by 25-50%. After Crysis 2 from 2011 I thought more games would come with it. Honestly, nobody wants to see those typical uniformly looking shadows anymore. Why...
Here's the official Microsoft page of Xbox One X Enhanced titles:
https://www.xbox.com/en-US/games/xbox-one/xbox-one-x-enhanced-list
Their currently featured enhanced titles are:
Forza 7
Assassins Creed Origins
Gears of War 4
MiddleEarth: Shadow of War
TitanFall 2
Rise of the Tomb Raider