I think there's no doubt that doctrine concept brought healing to the "next level" - even if people do not believe and/or understand the overall concept they still benefit from it
no one should run without a doctrine (and it has nothing to do with the frequency that you set your F165 on) - the proper frequency will be chosen appropriately anyway
you feel more like in control if you can run things yourself - but very often you really don't know what to treat anyway (unless you've got a very sophisticated method how to every minute determine what's currently active) so it's actually a big relief to let run doctrine and have someone (your guides) to decide what's appropriate / good at any given moment