Linguistics is a descriptive science.

Language though is not science, it's a cultural practice. Adhering to a specific set of rules to signal belonging to a specific cultural subgroup is perfectly normal; and deviation from those rules is not a socially neutral act. When and how you deviate signals a lot of things about you and what you're saying.

That's why slang is fascinating. It always tells a story. Whether it's English Prep School jargon that breached containment, whitewashed AAVL, group in-jokes, unconventional emojis, etc., a slang word says a lot about the person who uses it.

That is to say, if you unironically start saying "rooves", I can't say whether you'll start a trend that will ultimately change English forever (weirder things have happened). But I can assure you that the immediate effect will be that people will label you "tumblr weirdo". Which would be a correct assessment, so that's effective subtextual communication. Yay linguistics!