As kbolino said, value objects are immutable. If you can get a reference to a value object in an array, the array has to be immutable.
If you cannot get a reference, it's possible to maintain mutability, but all access would involve copies. But it's not clear that this is what most people want because it's rather similar to what you can do with library-based solutions today (involving ByteBuffers and whatnot).
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As kbolino said, value objects are immutable. If you can get a reference to a value object in an array, the array has to be immutable.
If you cannot get a reference, it's possible to maintain mutability, but all access would involve copies. But it's not clear that this is what most people want because it's rather similar to what you can do with library-based solutions today (involving ByteBuffers and whatnot).