If God wants to call a whale a big fish, stop telling God what to do. When terms are not defined directly by God, we need our own methods of dividing them into categories.
One could imagine a brain that thought about these characteristics like Network 1 here: One could imagine this model telling you everything you need to know.
Solomon says oh God, you are so annoying, who the hell cares whether whales have tiny little hairs or not.
In fact, the only thing Solomon cares about is whether responsibilities for his kingdom’s production of blubber and whale oil should go under his Ministry of Dag or Ministry of Behemah.
Now, there’s something wrong with saying “whales are phylogenetically just as closely related to bass, herring, and salmon as these three are related to each other.” What’s wrong with the statement is that it’s false. Suppose you travel back in time to ancient Israel and try to explain to King Solomon that whales are a kind of mammal and not a kind of fish.
Your translator isn’t very good, so you pause to explain “fish” and “mammal” to Solomon.