Just because shadowbringer doesnt openly talk as directly about topics we can hear about in the news every day doesnt mean there is no political commentary in it. The way society is built in the crystarium and in eulmore and how they are presented is political commentary. By extension of that the rebuilding of the eulmorian government is aswell.
There's also the quest about the saltery in the lochs (i think late stormblood) where you're taking direct steps that the production is owned by the ala mhigan workers who move there and not by greedy monetarists.
Political commentary is always there if you look for it. In FF14 it's often packaged in a noblebright frame: there is always hope and things can improve if everyone works together.