Exactly that, it's very helpful to give a bit guidance.
A good example here are pyramid quotes. When an established member is doing these (unfortunately many established members still don't care much about pyramid quotes, quoting properly, shitposting or even spelling, to avoid Denglish and more very simple things), a new member might come over these post and assume, that these bad habits are NOT frowned upon.
Seeing such bad habits will cause more damage because new members might repeat them and such bad habits will spread even more.
So, it's of high priority to create awareness.