While hitting 100% utilization will probably never happen in any significantly large application, in my experience almost every application has a good 10-30% of

While hitting 100% utilization will probably never happen in any significantly large application, in my experience almost every application has a good 10-30% of it that remains unused because they are extremely unintuitive to anyone who isn't on the development team, has a absolutely awful and inefficient workflow, or is so basic that it would only be of value to companies that would in no way be able to afford that application in the first place.