To be fair, MC isn't guaranteed to create those Elixirs. In fact, the chance of success seems to be less than 50%.
So sure, if you're willing to use up lots of materials and have a way to safely get rid of toxic alchemical waste, it's great as a national resource. But it's not good if what you need is steady and consistent results.
Medicine, when you've got some time? Great.
Immediate emergency healing? Fuck no, unless you're feeling lucky.
Combat, if you've got enough time (and MONEY for alchemical reagents) to prepare, like Batman? Yes, SSS-Rank.
Combat, where you don't have any time to prepare? Might as well play Russian roulette.