I believe that it's a team of four people, each with strengths and weaknesses who are on a common journey and have teamed up against the elements and a vengeful antagonist while on a journey to meet a common consultant.
I can't speak for Scarecrow and Lion, but in the book the tin man absolutely had prior business with the WWW that didn't end well.
All four of the travelers had a problem with no clear answer and were going to ask the Wizard who might have some sound advice. So it's a road trip for folks with a common destination
Also the flying monkeys were their own people and geased to obey the amulet, which WWW possessed.
Also, the solution really was the friends they made along the way. If I were Dorothy, I'd rather be there than Kansas.
"As for you, young lady, you want to go home, right?"
"No, not anymore. I wanna stay here and become the new Wicked Witch."
"Nonsense. Now click your big, honking boots together three times and wish to go home to Kansas, to live in poverty with your dirt-farming, tee-totalling aunt and uncle!"
It’s a story a pooling together making up for each others weaknesses and work as a team. in the end finding with some confidence or perspective from the people around them they may have had it in them all along but sometimes we need someone to show us the way. It’s a story how we are a collective people who are all individuals within them.
Though I realize the original post is just an easy joke
IDK about this one. The sequel (which is definitely canon /s) she lives in a mental institution from her severe delusions. at the end of the original she wakes up from her episode surrounded by loving family and all of those broken fantasy men are farm hands concerned about her. - just a joke