This is an Europe or US thing either. Tractors are pretty much the same worldwide, except for different features/options here and there.
All I said was that the tractors weren't design the in first place for loaders and still are not designed for loaders. The fact that they come with loaders with a manufacturers name on it, doesn't mean it was designed to have a loader. The loader is there because there is a demand for it and the manufacturer offer it. Most loaders are actually build by someone else for the tractor manufacturers.
If they changed the front axles over time, was mostly to accommodate for more steering angles and 4 wheel drive drive-train.
Any machine with loader, will have to change seals much more frequently. Either tractors, telehandlers, even actual loaders.. It's just the nature of the beast.
No one questioned if you were abusing your tractor or not. As far as I know, it's not my tractor, so I don't give a crap if you break it or not. I don't wish you that, but I still don't give a crap. You abuse it all you want.
If the tractors were actually designed for a loader, it would end up looking pretty much like a loader wouldn't it? With a bigger axle and wheels on the front to support all the extra forces.