Why can't I uninstall the preinstalled apps?

[AnotherElk]

@mrak

is there a reason that we can’t uninstall the pre-installed apps

There is no reason, because you actually can uninstall those Apps …

Uninstall default apps

You can uninstall pre-installed Apps. Whether “easily” applies is subjective. To uninstall Apps permanently … Note the package name of the App in Settings - Apps & notifications - (select the App) - Advanced - (the package name is given at the bottom of the page, e.g. foundation.e.calendar) If not done already, make the Developer options visible by tapping on the Build number in Settings - About phone a few times until you are being declared a developer. If not done already, enable S…