Generic delegates helps to

126.

overcome the type safety of the delegates

points to a generic method which has its own type parameters

It is not possible to have the delegates in a generic form

points to a method which has optional parameters

to have a method with constraint parameters

If a generic method has to exposed through a delegate then the delegate should be a generic delegate.
For example
delegate TResult MathFunction(T1 var1, T2 var2);

can point to a math function which could accept an interger or double or any other numeric types