Does that grate on anyone else’s ear? Is there, say, a “simplistic” analysis that is OK, but go a step beyond that and you have “over-simplistic”? Here’s an expert on computing platforms quoted in a NYTimes blog (6 Sep 2013) on Google’s cloud-computing expectations: “It’s an admission that their original vision was over-simplistic....” And that’s hardly a rare instance.
At my current favorite online dictionary, thefreedictionary.com, there’s a note to their definition saying, “Usage: Since simplistic already has too as part of its meaning, it is tautologous to talk about something being too simplistic or over-simplistic.” That doesn’t seem to stop folks from using it, though!
I know there are other similar tautologies in use today, so maybe other posters can bring some up.