They are trying to stop people who abuse the policies, not returns altogether. The article never says the retailers are making a move to stop returns from everyone. That kinda defeats the point you are trying to make.
>If I can't return an item, I will be much more cautious about buying in the first place.
Sounds like its working then. The point is the customers that feel they don't need to research an item they are purchasing cause they can 'just return it' are the ones they want to be more cautious about buying in the first place cause you are costing them more money.
Really sounds like you are arguing against a scenario that isn't taking place. You are actually bringing up points that made them decide to do this. They can deter constant returners from using returns as a 'try any item you like and return it' and also deter return frauds.