Agreed, but if you are already looking at DAO firearm with 2 models - one with, and one without the "double-strike" capability...the question becomes why wouldn't you want it?
On a 290 every time you pull trigger the hammer drops whether the action cycles or not
If you do go the p290 route make sure it is the p290RS model - true DAO operation. On the original model the hammer would only strike the firing pin if the slide had be cycled. So, if for some reason you needed to re-strike the primer on the same cartridge you couldn't.