Everything I'm about to say does not include Sonic Team, who do in fact appear to have gone insane.
Game developers and game publishers are two different kettles of fish.
A game developer is a guy with great ideas but no money.
A game publisher is a company with lots of money but no soul.
So Mr. Game Developer comes forth with great idea, and is given the cash to make it, but all along the way Mr. Publisher is peering over his shoulder going "no, don't do that, too risky, too innovative, might not sell. Do this, it's proven to work. No, don't do that, too expensive, we need to maximize profit. Oi, speed up, we need to get a christmas release out"
And if, against all odds, the developers actually make a good game (such as Bioshock)
Then the publishers speak the words that make developer and gamer alike cringe
"That was a success! Now make a sequel"