I don't think anyone has the need to check such a message for grammar or spelling mistakes.
Even then, I would not rely on a LLM to accurately track this "evolution of language".
fakedang
What if you're writing emails to GenZers?
dpassens
As a zoomer, I'd rather not receive emails that sound like they're written by a moron.
bombcar
Attempting to write like a GenZ when you’re not gets you “hello fellow kids” and “Boomer” right away.