Because it sounds like it is one component of feature unique to the Note 7. It could be as simple as one sourced part failing (last I heard they suspected the batteries from one source.)
No smart phone is built dramatically different than another. All of them have little Lithium Ion bombs ready to burst into flames if they fail or are punctured.
This reminds me of the hoverboard scare many months ago because of some of the cheap Chinese ones bursting into flames.
