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Not for nothing, ASL is a language, not English with hand gestures. This is as useful as showing a wall poster of the Greek alphabet and hoping to communicate with everyone in Greece.
Sure, it’s useful for spelling your name, but that is not language, your name is just the noise someone needs to make to get your attention.
Actually less useful. Most of the letters are shown as the viewer would see them, but some are from the perspective of the signer, with no indication which is which.