I think I've seen that old CS circulating around the net back then, even when I was only active in writing forums. It's good for personal practice to help with understanding your own characters a bit better, but as a CS there's just too much unnecessary details.

For the GMs, CS is something like an application form, because technically we are applying our character to join the GM's world and universe, and it's a way for the GM to find out if the player's character (or even the player themselves) are suited for the RP. This is especially so when the players joining are people you have never worked with before, and you don't know them well enough personally.

Of course, with people you've already built a good level of trust in, leeway and more flexibility can be worked out with them because there's mutual understanding between both parties to know how to work together with each other [s]unless that person is an insufferable douchebag, then I applaud your god-tier patience with such people[/s].

For me, as a player, the CS is more than an app form or something for formality sake. It is an archive, a library where everything I should know about someone's characters is kept so I can always go back to refer when I need to double check for consistency while working on my posts, or even collaborating with these players to interact with their characters. I mean, I can't possibly recall every little detail of every single character in all the roleplays I'm participating in, so other than going through the IC, the CS is important to me for reference purpose.