You don’t need a writing group. (That is my personal opinion and I will explain myself later.)
But you do need an awesome writing buddy so that, when you realize your novel (which you originally thought would be this pleasant 200-page YA book) has hit 501 pages and shows no sign of stopping, you can have amazing chat conversations like the following:
Ich: HOLY CRAP
Ich: SCVK [my novel] hit 500 pages.
Ich: *weeping*what is wrong with me.
Ich: *still weeping* Immo get you that weird Sleeping Beauty story soon.
Subs: You are AWESOME THAT IS WHAT.
You keep on working.
That is a YAY.
Ich: i hope i can answer for this in the afterlife
“Girl, what you doing half yo’ life?”
Subs: WRITING BOOKS LIKE A BOSS
Ich: “Mm…Mr. Saint Peter I wrote a lot of book.”
“Like, a LOT of book.”
OK i want you to write “WRITING BOOKS LIKE A BOSS” under my latest facébook post.
i will keep working
i will even put on pants now
and go get a new notebook
Subs: Yout put on them pants
Ich: i have to stop listening to duran duran first.
It is one of the blessings of old friends that you can afford to be stupid with them.
–Ralph Waldo Emerson