You are partially correct, especially when it comes to real photographs or AAA game scene.
However, there are a couple of issues to consider:
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Many art styles (are not photographs) cannot be accurately conveyed in words unless they are already well-known and popular, such as the DC comic style.
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Even if you try to provide a detailed description, you are still constrained by 256 tokens.
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Lack of diversity. In your example, consistency is indeed maintained to a certain extent, but it also means that anyone who knows your prompt can create images similar to your style. IMO, this possibility is very high.
This is why seeds are crucial because they can convey the artistic styles we desire, but cannot be described in words.
The beast image you generated may be look better than mine, but what if I just want the style of my beast image?
Also, seed can save tokens to some extent because it contains a lot of predefined information.