As said, I believe you are simplifying the problem significantly and thus making general claims which do not hold water.

Eg. even if you are DNS based but have direct SSH access to the system which has a query cached and root access on it (you need to manage all this too!), you can temporarily edit /etc/hosts or /etc/resolv.conf to workaround the cached value.

So my suggestion remains to keep working on a better argument and scenario by trying to understand exactly where your intuition applies — but be critical to yourself too, and think through if your alternative has any other cons too.

By doing so, you will likely find why everybody defaults to DNS for a named service registry in a sense.