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Using the sponge that way with that type of chemical will have the same surface aggression / result with pigmented leather . On a new well topcoated leather you will not get a massive amount of damage to the naked eye but on a worn leather, which is the majority of cleaning, it will rip the topcoat to shreds and also remove pigment.
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I would agree with you on this Paul, the pads are abrasive and if not used correctly could definitely damage worn leather surfaces but when used correctly there will be no problems. For any client we supply with this package we provide full instructional details to avoid any mishap taking place. We have been using this method for over 10 years with no difficulties. Like with all cleaning tasks if care is taken to analyse the job in question there should be no problems.