Those who are "proficient" in the software are most likely self-taught because the software is so easy to use. We leverage the technology the way we know how, regardless if it's the most efficient and effective way.
Who has time to sit in a boring class to learn a new way?
As a result, the quality of our deliverables suffer, hours & effort are wasted, and the integrity of the content is at risk. After all, if someone sees a mistake in your Excel report, nothing else can be trusted. Nothing.