I've experienced this too, and in practice DI&E reminds me of the kind of rules advocated for by people who live on a lake, ostensibly to protect the lake but in reality to preserve their own property value and make sure nobody can build near them. Making rules than mean explicit support and sponsorship are needed to get somebody though means that employees end up serving and being promoted at the pleasure of whoever is currently in power, giving them more power. There are many ways this works but all-in, it ends up just consolidating power, not achieving any of the ostensible aims (whether or not you think those aims are worthy)