Sorry but perhaps I wasn't clear. It was wrong for Saul to seek help or advice from the dead Samuel. It use to be punishable by death. The Lord exacted that punishment. That was then. This is now I suppose.
Lest you think I'm picking on Catholics I would stress that I'm equally "vile" with many Protestants. I can tell you I'm not the brightest bulb around but I see little sensible reasoning among many Christians today especially Protestants. Thinking is a dying art replaced by our five senses.
As Ben Franklin once said, "The trouble with common sense is that it's not too common."
Help no, advice, yes.
Fortunetelling is wrong. (Presumably I don't have to explain to you why it's wrong.) Conjuring up visions of anyone or demanding visions of anyone (Christ included) is also wrong.
(That's not to say that such visions don't happen. Demanding or expecting them, or trying to make them happen by some occultic means, is wrong.)
Conjuring up a vision of a dead person for the sake of fortunetelling is therefore wrong twice over. Consulting a witch for any purpose is wrong. Poor Saul: three strikes and he's out.
Merely communicating with (so-called) "dead" saints in glory is not wrong, because Jesus did it at the Transfiguration. Nor is one Christian asking another for help (help, not information or special gnosis) wrong.