Security implications of user owned directory in /Applications
On macOS, root doesn’t play much role as any user that is an administrator functions with the same power. When you type any admin user and that admin password in a permission dialog, that makes any user  (even a non-admin user) root.
Some apps have a script or framework to change ownership to root, others don’t change it (like when you copy an app from Downloads or a disk image)
The information you show makes no difference security wise. This is just permissions on a folder and package that anyone can read and execute. Other mechanisms check for known bad software and validate that parts of the application have not been tampered with.