Yes, the void is dangerous, but Umbric always preaches about using caution when handling it. In the war campaign, he talks about how it can be used for good and how the Horde would use it irresponsibly if they ever gained mastery of it. After summoning the void dinosaur he discusses how it isn’t particularly efficient but used for shock value. He also dismissed the ritual binding the void to the dinosaur, stating that it needed to be done before the entity became too powerful and one should always exercise caution when utilizing forces of this nature. Right now it seems the void elves are on top of their game.