Could be more features lead to more problems. Ice makers are highly desirable and often problematic.

Could be that US runs on 120vac and that means a lot of different parts.

Could be the US market gets more advanced compressors and what not to meet energy efficiency requirements (and maybe reduced noise) and Kazakhstan gets a simpler refrigerator that just keeps working.

Any product from almost any manufacturer has built-in obsolescence - unless you go mid-high end, like Bosch etc.

Sammy/LG/GE business models aren't built on services but volume. If you buy a third party warranty service, that solves the issue somewhat, but they churn out so many models that parts become scarce.

You just got lucky or your models are from a different era. I don't want to drop money on Bosch, so I buy the cheapest ones and just replace them when needed.