> It's usually because your company doesn't fundamentally want it.

BINGO. Managers and execs want (or get sold on) "agile" but only want it to affect the structure and processes for the very lowest-level workers. They don't want to change the organization or what they do, and odds are those are really bad and won't let most systems like this, agile or otherwise, function properly.

(The big secret is there's no framework like this that "works" for fixing broken organizations; there are [rare!] well-led well-managed organizations where damn near any halfway-reasonable system they choose will work, so if they decide to do Scrum or whatever in places like that it'll work just fine—and then there's everyone else)