Lack of persistence is one such reason. Because Go's built-in maps are not completely safe to use concurrently, too, their usefulness as a key/value store is so

Lack of persistence is one such reason. Because Go's built-in maps are not completely safe to use concurrently, too, their usefulness as a key/value store is somewhat limited in many applications. Naturally, it's possible to build a solution to persist Go maps and to make them safe to access across goroutines, but by that point you've built a persistent key/value store.