Indiana is a unique state, or at least it was, when it comes to DST. Most of the state didn't observer DST until around 2006. Before that, the only thing that changed was TV schedules. Prime time was 7-10pm in winter. When the rest of the country changed times, we didn't, but prime time was 8-11pm.
In summer, we were an hour behind Michigan and Ohio, but on the same time as Illinois. In winter, we were on the same time as Michigan and Ohio, but an hour ahead of Illinois. EXCEPT for 4 counties that were over by Chicago were always on Chicago time, and a few counties in SW Indiana were on Chicago time. We always called the Central Time Zone the Chicago Time Zone.
Today, 80 counties out of 92 are on Eastern Time all year long. The other 12 are on CST all year long.
Geographically, all of Indiana SHOULD be in the CST, as was mentioned, the sun is at high noon around 2pm in summer. This indicates we should shift to the west out of the EST.
I'd prefer to just leave it the way it is right now. Almost all of our clocks reset themselves automatically, I get more done after work when it's light out, we can enjoy outdoor recreation in daylight after work, etc.