Language features generally solve problems users experience in real projects. Sometimes they do a better or worse job (see C++17 variant/visit in contrast), but

Language features generally solve problems users experience in real projects. Sometimes they do a better or worse job (see C++17 variant/visit in contrast), but the goal is virtually always to turn a larger, difficult-to-understand, complex, or error-prone set of statements into a smaller, easier-to-understand, simpler, resilient set of ones. Complexity that isn’t solved in the language itself inevitably works its way into projects that use it, which is why abstractions and standard libraries exist in the first place.