There was an explicit advice in the famous Apple Interface Guidelines that a good user interface should have all features be discoverable. The quintessential ex

There was an explicit advice in the famous Apple Interface Guidelines that a good user interface should have all features be discoverable. The quintessential example was most things should appear in the menus but the menus will tell you about hotkeys. That was on contrast to DOS programs of the day where there were no menus and you were required to read the manual to even get started.