Why is this switch on type case considered confusing?

Question

I was looking for a way to refactor and simplify one function where I have to do data sorting depending on input class type, and got stuck at switch(input.GetType()):<

Answer 1

It seems you don't expect the switch to match on subclasses. But this would break the Liskov Substitution Principle. (where if you passed in a C object, the code would work, but not with a D, even though D is a subclass of C).