My opinion is its very hard to putt without some kind of guidance, with nothing at all you are just guessing.
So people have a choice, either guess, use avatar movements or make a homemade scale.
Yes a scale makes it much easier (and is needed for the new TM putter since the avatar movements are dumb on the 60 foot scale) and that is why they should go to a 3 click meter (with a slower backwing than forward swing however).
The ideal and most realistic way to have this IMHO is have the meter divided by 10 (for ease of division) and make it a 3 click meter with an overpower zone, then you have to click where you want the power (not just take your sweet time choosing exactly where you want it) even if its moving slower on the backswing, which I think it should be, again realism.
My 2 cents