It is apparent that IN - a good part of it - is at slightly lower resolution than some of the highly populated areas as in the post you mention. But it still has higher resolution than most areas of the USA. See cripplecreek's post at 33. I am curious why the state shows up as better-covered in general than most others. I can see my house fairly well, but not my vehicle except for a few burgundy pixels.
I suspect that Indiana had an aerial survey done at about 5000 feet (which is where the Indiana photos appear to be sharpest)... and that is what Google has licensed for its closest approach. On the other hand, some other states such as California, apparently had an aerial survey done at a about 1000 feet... and that is what Google has licensed. That would explain the distinct bordering on the state border. Missouri may have done the same.