Why sealed classes are not allowed to be generic type constraints?

Question

I just wanted to know why sealed classes are not allowed to be generic type constraints?

Let's suppose i have a simple code snippet in c# as bellow

 public sealed class Base
{
    public Base() { }
}

public class Derived<T>
        where T : Base
{
    public Derived() { }
}

When i am instantiating the Derivedclass i am getting 'Base' is not a valid constraint. A type used as a constraint must be an interface, a non-sealed class or a type parameter.

Answer 1

Because then there's no point in it being generic. T could only be Base, so you might as well make it a non-generic type to start with.

Why would you want Derived to be generic here? Why would you want a type called Base (implying that it should be a base type) to be sealed?

Answer 2

Because T will never have child classes! There's no point to have such kind of generic.