As of now, Apple Watch owners can remove only third-party apps, which they've installed from the App Store as well as system apps that have their iOS counterparts. Meaning, removing iOS apps will also uninstall their WatchOS alternatives. But with the upcoming WatchOS 6 update, Apple will let you remove system apps that can be found only on Apple Watch. This feature will be especially useful if you are running low on space and want to clear the clutter. Apps like ECG, which is available only in some regions, can be uninstalled and if you change your mind later, the pre-installed apps...
Source: https://www.gsmarena.com/watchos_6_will_let_you_delete_system_apps_on_your_apple_watch-news-37685.php
