I would expand it to not only immortality, but everything else, actually. There is a bunch of super geniuses like Richards and Stark, who are smart enough to create weapons to defeat gods, teleporters to other planets and dimensions, time machines, etc., but apparently they are too busy to invent something that would actually help improve ordinary people lives. The most ridiculous example of this IMHO was during Terrigen Cloud time. It happened shortly after the Secret Wars, where these geniuses managed to create vehicle to survive the destruction of the multiverse, but somehow, none of them could do anything about stupid toxic cloud that forcefully transformed people against their will and in some cases killed these people, in addition to poisoning all mutants. For the sake of plot all these geniuses became stupid and could not think about any solution.