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I don't think you're missing anything. Years ago, I made the same observation, and ran a test to compare independent hash functions vs salting. It showed no difference. I would be interested if someone here has a different opinion and a rationale to explain what I might have missed.

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You are processing more data if you use salts. I would think this is almost certainly slower than just using hard coded hash functions with different constants. But maybe not, or maybe the difference isn't noticeable.

Seems legit. Good hash function digests should be as independent from each other respecting seed, as they are from digests of other hash functions with the same seed.

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