Do we have the performance analyser to say this is not demanding or not and better access to code to say they can improve the performance and add more effect?
Teams do different things some baked GI because they don't have changing weather or day/night cycle and have few dynamic lighning. Other will need dynamic lighting with changing weather and day/night cycle. Some do Open world, some not...
It is not because someone do dynamic lightning than they will push further a machine than other people, the power can be used elsewhere....
Different game, different constraint, different artistic choice too like more stylized graphics for Uncharted 4 and so on....
Best graphics is highly subjective... I give TO 1886 best graphics because I am impressed by the work on materials and the high level of everything else...