The policy would disable Hibernate entirely. There is no fidelity of control to just disable the Fast Startup feature (which relies on Hibernate). Ultimately it's left on because it cuts boot time significantly which is one of our biggest end user experience metrics. It's a good ask for being able to turn off in certain scenarios, but disabling across the organization could optimize for the edge case (user shut down versus restarted and something like an app or driver did not load properly) while (possibly) hurting the common case of improved startup time.