So ultimately though, Outlook ignores the Default Browser setting of the OS, unless you tell it not to? Does that mean that it's ok for every application to ign

So ultimately though, Outlook ignores the Default Browser setting of the OS, unless you tell it not to? Does that mean that it's ok for every application to ignore the system-wide settings until you explicitly configure it otherwise? Then what it the point of having system-wide settings in the first place?