This is true. It is, however, still an upside of Go for the Throat, as the situation will come up. I'm not saying Dismember is a bad card, far from it. Simply pointing out that it is not "better," just different. There are situations in which each card shines. Dismember is better if you're facing down a Precursor Golem. But I'd rather have Go for the Throat if I need to kill a titan. Frankly, you're probably best off playing a mix of both spells.