I'm talking about deleting apps that are included in the macOS installer, NOT 3rd party apps or App Store purchases.
That would explain it then. Those apps are owned by System and even administrative privileges are insufficient to delete or modify them. You are might be able to delete them, if you activate the Root user and log on as Root. (You will find instructions in
this Apple Support article.) Seventeen or eighteen years ago that was a fairly common practice, but I haven't tried it in at least fifteen years and the latest Apple support article is from 2017 so it may or may not still be possible in MACOS 10.15.3.
WARNING: Because Apple reuses application functions throughout the OS and other Apple and third party apps, deleting those apps may render certain functionalities or even the entire OS inoperable and the only recovery is reinstalling.
CAUTION: Back in the day when logging on as Root was practiced more often, common wisdom held that you...
- ...logged in as Root only to accomplish a specific task.
- ...deleted the Root user account immediately after completing the specific task.
- ...never, ever, ran normally while logged in as Root.
COMMENT: It is a safe bet that any changes in deleting apps between 10.15.2 and 10.15.3 are the result of increased security protections.
