I think part of the issue is a "cultural" one. The south korean brands aren't into being nannies and nurse maids like the us brands tend to be. I think part of that is cultural based, and part of it is they just don't think about the general public being "sue happy" like the us brands are used to dealing with.
So if you're a complete "doorknob" (clean version) type operator, you can get yourself (and your tractor) into way more trouble with a korean tractor, because they are less interested in having this nanny "safety net" under you. They actually consider the operator will actually know what they are doing and NOT try to lift an unsafe load. That "unsafe" can come in many forms, like no or not enough
ballast weight, lifting too high for no reason, lifting heavy on uneven ground. Lots of factors can take a "safe" load, and make it suddenly "unsafe".
Where as the us brands are well and truly used to being sued for anything from a hangnail while steering, to being sued for not warning the operator to not drink the battery acid.
Where as the south korean companies are used to dealing with (korean) operators of equipment that will actually know what the hell they are doing, and how to do it safely. Sometimes that is good, and sometimes that can end badly, especially with a brand new tractor owner/operator.
But if someone is fully committed to breaking their tractor, they will. You can take a brand new (any brand) tractor and break it with 0.1 hours on the meter if you really try.
My 4200 lb bare frame (7000 lb dressed out) tractor is rated for 2200 lbs at the pins. I've had 1600-1800 lbs on the 4' forks, or a 6' round bale on the bale spear, and that's really all it wants. I didn't lift any of those loads any higher than necessary, and not on uneven ground. I also had filled rears and a rear ballast weight on when I did it. If I had tried hard enough (no ballast, no filled rears), I'm sure I could have broken my front axle. But since I WASN'T a complete "doorknob" (again, clean version) I didn't do that.