Well on rather short putt missing the ding on purpose could work but for putts beyond 8-10ft or so, I doubt it's an efficient method. Also sometime you have to move the aim by several blocks on the grid (large breaks and/or long putts). In those case, I doubt also that missing the ding is working well. So since there are situations where one have to move the aim, it's perhaps good to use the same method all the time to be systematic.
Another point is that as soon as you miss the ding, forgiveness start to play. Forgiveness is a random process, sometime clubs forgive more, sometime less. So if you do 10 times the same putt (not a short one, but a 10+ ft), missing the ding at the same position, the trajectory of the ball will not be 10 times the same and thus you can miss some putt. But now if you do 10 times the same putts and ding them all, the trajectory will be essentially the same if your putter is accurate (precision) enough.
So the best to me, is to get the most accurate putter and try to ding it (thus moving the aim). Like this you get consistent trajectories and can better learn to putt. Missing the ding introduce a random process (forgiveness) which make the trajectory less consistent from 1 putt to another and it's thus harder to learn.
Regards