The arguments against loading are mainly corrosion, fuel efficiency, and lawn damage. The corrosion thing is licked today by non-corrosive liquids (like rim-guard). There is not much you can do about the decrease in fuel efficiency, or increase in lawn damage. As you have seen, there are giant increases in stability and traction from that loading, which nearly always make it worth it, especially on a tractor with a front loader. Some will argue that it is a lot better to add iron weights as needed to the rears. Putting them on or off is no "piece of cake" however. There are definitely times I would not want loaded tires, such as on my tricycle-front, log dragging tractor. That thing really minimizes "rutting" of the woods. Also, lawn-mowing is very obvious. Any job that benefits much from greater traction, or greater stability is helped a lot by loading the tires.