Yeah, I think that an unexpected drawback to autodosing, no matter how you accomplish it, is that you have to have records. You've got to know how much of what you are putting in your dosing reservoir, and at what intervals. Since you can't be certain of how much is going in (at least for DIY rigs), so your records are the only way to know how much is being used.
And then, on top of that, you've got to do periodic testing still. Otherwise you don't know when to change your mix, or your amounts.
Auto dosing is automated, but unfortunately not magic. It still takes work. But if you are doing it right, you should eventually be doing a lot less work, a lot less often.
