Have another look at that first photo – it is a good mount compared to a basic (cheaply produced) punched hole. By separating the blade from the mounting system they can be sold separately, meaning you can get a much more substantial mount that you don’t pay for every blade. Instead of pushing the (debatable) cost savings, what should be pushed is the quality benefits of the WSE system. On the other hand it is not all bad, there is a good justification for considering these blades – it is a pity that it isn’t this aspect that isn’t being pushed. Keeping in mind too, these are consumables, not something intended to last for years. Wouldn’t seem to offer much of a cost saving, and it would be rare indeed for someone to own more than one type of machine to want to swap the blades from one to the next.
