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Unless you have the su binary on your device, you will not be able to change anything in /system/app or /system/priv-app
/system is mounted at runtime as a read-only filesystem - you would need to remount this as read-write before uninstalling app (which is just moving / deleting apks), and this can only be done as root
If it is already mounted (for whatever reason) you would still need to have a user that had rw permissions on the folders. /system/app & /system/priv-app are owned by root:root
(user apps are in /data/app, which is owned by system:system)
NotThamesWater-
https://forum.xda-developers.com/android/general/guide-to-disable-oem-bloatware-aka-apps-t3779873
as it means that these applications truly aren’t being uninstalled from the device, they are just being uninstalled for the current user (user 0 is the default/main user of the phone). That’s why, if you omit the “–user 0” and “-k” part of the command, the command won’t work. These two commands respectively specify that the system app will only be uninstalled for the current user (and not all users, which is something that requires root access) and that the cache/data of the system application will be preserved (which can’t be removed without root access). Therefore, even if you “uninstall” a system application using this method, you can still receive official OTA updates from your carrier or OEM.
Ricochet
You can uninstall/disable system apps using adb shell uninstall commands and command prompt. No need for root i believe just few drivers on your computer.