Why would you need a generic global key-value store? One with excruciatingly bad performance (apart from the inherent thread-unsafety) that stores keys and valu

Why would you need a generic global key-value store? One with excruciatingly bad performance (apart from the inherent thread-unsafety) that stores keys and values encoded in text form as KEY=VALUE? I've never needed such a thing. Much better to use proper globals, or to use hashes, maps, arrays, ... depending on the context. And why should it be _a_ global store, instead of a structure that you can instantiate as many times as you want (if you really need to, as a global)?