I think there's a better version of this, and it fits well with Hickey's predilection for etymology dictionaries in particular:
Words are embedded in (yes, evolving) traditions of use. They are situated in systems of other words and ideas. A precise definition (and often a history of the word and the turna its meaning has taken over time) serves to train you, just a little, in that entire tradition— in its motivations, its other ideas, and adjacent terms. It gives you clues about what distinguishes it connotatively and denotativelu from its nearest synonyms. It helps you maintain intelligibility with written works that use older senses of the word. For words in your native tongue, that also means that, in a sense, it helps keep your own cultural history open to you.
So if I had to push a norm, it wouldn't be "stick to old, established definitions" or "arguments are stronger when we use old definitions". It would be something like:
> It is better to keep in contact with what makes a word special, with the stories and arguments it was created to tell. And arguments about whether X is a Y are sometimes arguments about whether we are losing contact with a concept that Y once helped clarify and communicate. If that's happening, it's sometimes an argument worth being sensitive to and propagating, so honestly consider it.