Granted I haven’t seen the bug in awhile, but I also never saw acknowledgement of it being fixed so…
I would not consider something so confusing to the end user to be a security feature. This is a bug, or you could use the label "broken".
The only apps I run from /Applications that aren't part of the OS are the ones that still use "Installers" like Adobe apps, because I assume they spew crap all over anyway. I haven't tried moving those, but I wouldn't be surprised if they deeply cared.
[1] The idea being that I could then migrate more easily by copying the whole home directory, and thus all my apps that didn't require "installation" would come over.
Unrelated, but this is what I find so interesting and cool about the drag-and-drop to install method prevalent on macOS. People complain, but what I guess they don't realize is that all they're doing is moving a folder into their `Applications` folder and that the "wizard" way they're used to is far messier.
Granted, since I think it's up to the developers, they often seem to make the user drag and drop into the root `Applications` folder.
But just think about how much fun phone apps could have been if you first installed an installer and than than that downloaded an app to install the side components before launching a configuration program for installing that specific software suite
It's been a while since I did this, and I can't remember the details. Sorry. Someone else might.
Maybe that's not realistic, though.
I still think there's something to be said about an installation/uninstallation process that relies purely on moving files around, no custom script execution.
[0] https://www.nextcomputers.org/files/manuals/nd/Concepts/Inst...
(Although you could get closer to that with an iPod back in the day! Lots of my fellow Apple Store employees kept a lot of apps and things on their iPods!)