While certain commands are clearly good to learn, it does require consistency across applications. One or two offenders, especially high-profile ones (Outlook!

While certain commands are clearly good to learn, it does require consistency across applications. One or two offenders, especially high-profile ones (Outlook!), can screw it all up. If a user does start exploring short-cuts and keeps being "burned" by unexpected behaviors, they will un-learn those short-cuts because they just aren't useful.