If you did the exact same study with Superman, you'd certainly not find his "story power" has been increasing. In the early comics he was the sole hero, so he'd be getting perfect scores for all those.
Perfect score? You really think Superman was the only Golden Age Hero too?
Lets assume you're correct and Superman would have got the Perfect Score of 35 because he was the only hero. This assumes that all the characters were put on a scale, and ranked from best to worst. This would imply that 18 would be the median score meaning that the modern day score of 22.5 implys ether a favoritism towards women, or that it's reached equilibrium, but since the measurement error wasn't given in the article that makes it fairly difficult to ascertain.
However if you had bothered to read the article you'd know that's not what she did, and would still need the male score in order to extract any meaning at all. As for Superman and talking about the abstract "important issues" there is clear power creep between Silver Age stories with Fat Superman to the more serious Modern Area with Infinite Crisis. It's the problem with the Slapstick 60's and the slow methodical March to the age of Miller.
For having a vastly inferior collection of window dressing. (I kinda miss the zombie attacks). Lack of a Day Night Cycle(days just go by too fast). The base game of Skylines is rock solid. I'm sure the modders will put some of the stuff I miss back in. In the mean time I'm just having fun making a functional Highway network.
I do miss some of the research unlockables too. Getting unlockables by simply having a large enough population seems unforfilling. I liked having to research the advanced tech at the university.