Unfortunately Elixir doesn't solve any problem which isn't already solved by more popular languages such as Golang, JavaScript/Node.js, Java, C# or Python and the result is neither more efficient nor more maintainable... But its lack of adoption is a problem as it limits your ability to access many powerful libraries and tools that are available when using other more popular languages.
Programming languages aren't so different from spoken languages... Linguists can nit pick various pros and cons of different languages but ultimately it's not an author's language which determines whether or not their novel will earn them a Pulitzer prize in literature... Yet there is a good reason why no serious author will write a novel in Klingon (and it has nothing to do with the characteristics of the language itself). Same goes for programming languages and programmers.