If doesn't want to provide app lock, then starts all things happen in secure folder, nothing left out from secure folder, & must provide an option to add app shortcut add to apps screen as well as to home screen.
Samsung unable to provide a full OS update in a year thats why its policy to release in steps like 7.0, 7.1,7.5,8.0 etc all these count in major os updates. Thanks samsung to provide me strong reason for switch to Iphone.