Like others have said, it's a rough draft and the studio wants to decide if they're going to pick it up. The Sopranos was a massive, sprawling project and not everyone was on board with it. It wasn't just some loser ABC sitcom that they wanted to push out for a few bucks as quickly as possible.
If you want to learn more, I suggest reading The Revolution was Televised by Alan Sepinwall. Great book and it goes into detail about the creation of The Sopranos: https://www.amazon.com/Revolution-Was-Televised-Slingers-Slayers-ebook/dp/B00B26PWFE/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1505967521&sr=1-2