Deleting an element from a slice is a O(n) operation. It better be explicit in the program so the programmer knows just how expensive it is. Either you know what you are doing, and then writing it down is trivial, or you don't know what you are doing, and you are creating an efficiency problem for the future. Other data structures have a delete operation because it is efficient on those.

And fully agree on the GC part. GC doesn't remove the work of resource management. It simplifies it vastly. This can some times lull people into thinking they can ignore resources altogether.