[ithkuil]

> "Rules" are just discovered patterns in the arbitrariness of language, convenient ways to capture and communicate how most people

Yes, that's a the descriptive rules. They are useful for people who are interested in understanding how the language works or for people who just want to be more effective at communicating.

But then there are also "prescriptive rules", which are rules that don't necessarily reflect how the language works but are rather about how the language "ought to work". These are useful for people who want to create a distinction between an in-group and out-group, or generally just want to preserve how things used to be in the golden days of when they were young (or so they think).