Because it's not maintainable in a large code base. You write your code, and move on to something else, someone else comes a long and does a refactor, but they

Because it's not maintainable in a large code base. You write your code, and move on to something else, someone else comes a long and does a refactor, but they and/or the IDE misses the member names that were in strings. The program crashes on the next deploy because it built just fine. Reflection is like anything else it can be used properly and it can be abused. I've seen it abused far too many times. I realize there are times in Java when reflection is unavoidable (Android's animation libraries rely on it), but I consider it to be a feature of C# that, so far, I've never had to use reflection in C#.