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.