OEMs pre-load phones with apps to improve user experience, but not all the pre-loaded apps and features are important to all users or some users have their own preferred app for a particular task, for example, most of the users prefer Google Calendar and Keep Notes over Custom Calendar and Notes apps that come pre-installed with the device. If you use a phone running a forked version of Android like MIUI, realme UI or ColorOS, you must have found some apps unnecessary at some point in time.