PC "Back story", why is that a thing?

[2D8HP]

That's just not cricket.

@Red Fel,
Your right. I'm sorry. I feel bad.
Edit:
I was trying to (and eventually failed) to get a "seat" at a PbP game. I was deeply frustrated. I am not a good enough writer.
Probably for the best that I was rejected.
Thanks for your wisdom and honesty.
Please feel free to PM about any posts of mine that seem more cruel than funny, so that I may delete or edit them. My hope is to make people laugh not to grind their teeth
-EDIT-
@Red Fel, RED FEL RED FEL RED FEL
I've actually re-reconsidered my deleted post.
I don't remember writing that it's bad to write a back story. What I object to is the requirement to write ever longer ones to get to play at all (yes I realize "their game, their rules".
Since you are a very effective post writter (I'm being sincere) please enlighten me further.
-Thanks