Heap versus Stack allocation implications (.NET)

Question

From an SO answer¹ about Heap and Stack, it raised me a question: Why it is important to know where the variables are allocated?

At anoth

Answer 1

I think the simplest reason is that if it is in the Heap the the garbage collection needs to deal with the variable once it is no longer needed. When on a Stack, the variable is dismissed with whatever was using it, such as a method that instantiated it.