The main ingredients of a "successful ditching" are wings level, minimum rate of descent (less than 100fpm) and minimum speed just above stall.
If you try that in a simulator, you will see how difficult it is to achieve ALL three conditions. Try it yourself!
Most airline pilots would prefer to take the professional advice of the manufacturer which is somewhat different to that which you advocate.
For example from the Boeing 737 QRH (selected edits for brevity).
"Plan a flaps 40 landing unless another configuration is needed. Select VREF 40 (my note: not minimum speed just above the stall)
Ditching Final. Maintain speed at VREF. Flare the airplane to achieve the minimum rate of descent at touchdown.
Maintain 200-300fpm rate of descent until the start of the flare."
It is certainly not difficult to achieve all of the conditions above providing you are competent at basic instrument flying. After all, apart from the instrument flying bit, a PPL should be able to do that for a short field landing in a Cessna 172. A properly maintained Level D Full Flight simulator has that fidelity. It is the pilot that lacks the fidelity if he can't fly that in a simulator.