I tested the game with only 2 lines of items, it's more than enough to make some really cool stuffs.This is also detrimental to the sales of the game.
We all know that Youtube and Twitch have some effect on game sales. Sometimes it's insignificant, but sometimes it's not. Streamers are going to get this game and on day one show... what? The extreme basics. Boring. Imagine if at the Nintendo World Championships, the custom levels only had day one items. I mean you don't even get the fire flower until day 2.
And what about if you show this game to your friends?
Friend: Oh cool, you can make your own Mario levels? Dude, put a bunch of Boos here, I love those things.
You: Can you come back on Thursday?
I would agree that the just the 1rst line is pretty limiting but by a day or 2, you should have enough to making something worthwhile.
It's really not that big of a deal really.
What killed LBP for me was the shitty physics so I'm already in a better place day 1 on this.