Creating new alts helps you avoid the crazy reddit/4chan people most of all. It’s questionable if it works with Feds tbh, doubt it hurts though.

There is no such thing as perfect anonymity, but it is a small and simple step which makes it harder to build a profile of you. If you slip up, the amount of informstion that can be gleaned is more limited.

You don’t really have to be good at changing your writing style to avoid stylometric techniques.

This New Scientist article reports that just actively trying to imitate the style of someone else is enough to fool writing style fingerprint software, even when lacking any formal training in linguistics, albeit the article is from 2009 so it may be outdated.

Here is a Whonix wiki article on stylometry.

Just do not reveal your family crest or whatever