What exactly you see on a tractor that tells you it was designed to have a loader? They still have the weakest axle and subframe under that loader... Sure, manufacturers offer a loader because there is a demand for it, but still doesn't make it designed to have a loader.
Around here, you really can't buy a tractor off the dealer with the so called "factory" loader on it. It will be aftermarket, and even if it has the sticker saying the manufacturer of the tractor, chances are it will be a Stoll, Quicke loader or any other manufacturer on that specific country.