I suppose it all depends on whether you're in the "if it ain't broke don't fix it" school or the "I want the latest bleeding edge everything" school. I'm in the latter so updated the bootloader. It's a very simple and quick thing to do and can't imagine why it'd cause problems assuming you have drivers correct and use the correct command line and image.
While I can understand the if it ain't broke philosophy, one still has to wonder then why Google updated it. What did they see fit for it to change? That's why I updated. Along with, you know, absolutely needing to be bleeding edge lol.